What and what can be the subject of field protection

The victim at the scene and the scene environment are the main body of on-site protection, and only by protecting these and waiting for the public security personnel to come, can the public security personnel look for clues to solve the crime from the first crime scene. If the scene is destroyed, a lot of evidence will be lost, which will make it more difficult to detect.

1. Different in nature: interrupt is a kind of electrical signal, which will be generated when a certain event occurs in the device, and the electrical signal will be sent to the neutral fault controller through the bus. Protecting the field is to save the state of the CPU, that is, the entrance address of the interrupt, in the register when there is an interrupt.

2. Different characteristics: the protection of the site is to save the state of the moment before the interruption from being destroyed. Hard interrupts have an IRQ (Interrupt Request) for each device or set of devices. Based on IRQ, the CPU can distribute the corresponding requests to the corresponding hardware drivers.

3. The process is different: in the microcomputer system, for external interrupts, the interrupt request signal is generated by the external device and applied to the NMI or INTR pin of the CPU, and the CPU continuously detects the NMI and NTR pin signals to identify whether there is an interrupt request. Protecting the site protects the CPU site by using a series of push commands, that is, the contents of the relevant registers are protected into the stack.

The on-site protection team is mainly composed of public security grassroots security organizations and security personnel.

The on-site protection group should rely on grass-roots organizations, traffic police, and the general public, and after receiving a report, it should notify the on-site protection personnel to delineate the scope of on-site protection, maintain order, and not allow anyone to enter. The on-site protection team is mainly responsible for the vigilance of the accident scene; prevent non-emergency rescue personnel from entering the scene; to maintain law and order; Responsible for protecting the personal safety of rescue personnel.

Site Protection Procedures:

1. Block the guard site, arrange a cordon, and maintain order. Before public security personnel arrive to investigate, a protected area should be designated to cordon off the crime scene according to the internal state of the scene and the surrounding environment, and guards should be set up around the protected area, prohibiting unrelated personnel from entering or staying at the scene, and promptly reporting to the public security department in the fastest way.

2. Take emergency measures in a timely manner. The emergency measures taken during the protection phase include: saving lives, eliminating dangerous situations, removing traffic obstacles, and monitoring and controlling criminal suspects.

3. Keep abreast of the case situation. After the security guard arrives at the scene, he should collect all kinds of information before the scene is protected; Eyewitnesses should pay attention to discovering and collecting all kinds of clues when discussing and giving feedback on suspicious persons and suspicious situations, and when necessary, they may also register relevant witnesses present to cooperate with the follow-up investigation by public security personnel.

4. Make a detailed report to the survey personnel. After the on-site investigators arrive, the security personnel should take the initiative to provide the investigators with all the information about the scene, such as the discovery of the case, the occurrence of the case, the protection of the scene, and other information about the scene.

Summary. The whole process of on-site investigation, the stage of on-site protection is the whole process of on-site investigation, on-site protection needs to be set up in a timely manner within the demarcated range, strictly seal and guard the scene, prohibit anyone from entering and leaving the scene, shall not touch and move any items on the scene at will, shall not conduct on-site investigation without authorization, protect the traces and physical evidence that may be destroyed, and persuade the onlookers to leave.

The whole process of on-site investigation, the stage of on-site protection is the whole process of on-site investigation, on-site protection needs to be on guard in a timely manner within the demarcated range, strictly seal the return of the bird to guard the scene, prohibit anyone from entering and leaving the scene, do not touch and move any items on the scene at will, do not conduct on-site investigation without authorization, protect the traces and physical evidence that can be destroyed by hunger, and persuade the onlookers to leave.

On-site protection is conducive to the restoration of things, and on-site protection is of great significance to restore the truth of things.

Methods of criminal scene protection.

The methods of criminal scene protection can be divided into indoor scene protection methods and open-air scene protection methods due to different types of crime scenes.

1. Indoor on-site protection methods.

"Indoor crime scene" refers to the location of all kinds of criminal crimes that occur in non-open buildings and the place where traces and physical evidence are left. For the protection of indoor sites, the usual measures are as follows:

1) Blocking the exit and access to the site. Blocking entrances and exits, with a focus on the population where the field center is located; Arrange special guards at the door, window and important passages, and if it is a two-way passage, it must be blocked completely, and all unrelated personnel are prohibited from entering the scene.

2) Cordon off the area around the site. Draw a certain warning area around the scene, arrange a cordon, and prohibit onlookers from approaching the scene, so as to prevent the destruction of criminal traces and physical evidence on the periphery of the scene.

3) When implementing closure measures, do not move doors and windows casually, and pay special attention to whether the traces on doors and windows, door locks, and window latches have been damaged.

4) Ask the victim and eyewitnesses to wait for the public security personnel to arrive, and follow the arrangements of the public security personnel after the public security personnel arrive at the scene.

2. Protection methods for open-air sites.

For the pure Zheng open-air scene that occurs outdoors, a certain area is usually set aside to arrange a vigilance. In principle, the scope of protection should include the place where the offender committed the offense and all the places where traces and physical evidence related to the offense were left. In practice, the usual practice is to make a sock song first to delineate the scope slightly larger, and then adjust it according to the situation after the surveyor arrives at the scene.

Here's how:

1) For the open-air scene with a small range, you can use ropes or white ash around the perimeter as warning signs to prevent others from entering.

2) For the road passing through the scene, if necessary, the traffic can be temporarily interrupted and pedestrians or vehicles can be directed to detour.

3) For the important parts of the site and the entrance and exit of the site, guards or barriers shall be set up to cover them.

4) For the site in the open space in the courtyard, the gate can be closed, and if there are other residents inside, a passage can be drawn to facilitate the entry and exit of residents.

(5) When the environment changes (such as weather), appropriate protective measures should be taken for the volatile traces and physical evidence on the scene; Livestock and pets should be prevented from entering the scene and destroying traces and physical evidence at the field scene.

The protection of the scene is: when there is an interrupt, save the current state of the CPU, that is, the entrance address of the interrupt, in the register, and then move on to other tasks, and when the task is completed, take the address from the register and continue to execute. Vertical protection of the present macro field is actually to preserve the state of the moment before the interruption from being destroyed.

Answers]: a, c, d

Fire scene protection methods: (1) on-site protection and elimination in fire extinguishing, (2) investigation site protection; (3) Traces and physical evidence scene protection Hu Xian.

In the interrupt service program, some special function registers, such as acc, psw, and dptr, are usually involved, and the pre-closed data of these special function registers before the interrupt is interrupted will be used after the interrupt returns, and if it is changed in the interrupt service program, an error will occur after returning to the main program. Therefore, it is required that the data before the interrupt of these special function registers is saved and restored when the interrupt returns.

The so-called protection site refers to pressing the contents of the relevant registers at the breakpoint pants into the stack protection.

The content that needs to be protected is the content that needs to be restored when the return is interrupted, and the world does not need to be protected if it is not restored. This is usually the special function registers ACC, PSW, and DPTR, etc.

The restoration site corresponds to the protection site, which means that the content that was pressed into the stack during the original protection site is ejected from the stack and sent back to the original relevant register before the interruption returns.

The restoration site corresponds to the protection site, and the content of restoration is the content of protection. For 80C51, the use of stacks to protect and restore the site needs to follow the principle of first-in, last-out, last-in, first-out.