Ask a mentally handicapped question, which friend will answer it

If you are an original machine, the switch is to determine whether the case has been opened, and once it has been opened, the next time it is opened, it will report the information that your case has been opened. If it's a compatible machine, I haven't really seen this kind of switch.

That's the power switch.

Isn't the main unit equipped with a power supply? That's the switch for that power supply.

Protection switches, for example, if you want to update the BIOS, you need to turn on this switch. It is common on some brand machines.

Have you seen the power switch connected to the motherboard?

If the landlord is a Lenovo computer, who should I call **? You can open the user manual and check if it is called "BIOS Protection Switch".

Big Brother: You're so talented.

In fact, there is no switch in the back of a general computer.

But like a Dell computer, it has a red switch on the back of the case, which regulates the voltage. Because some countries have a voltage of 115V, and some have a voltage of 230, so you can adjust the power supply to the required voltage through it.

So I don't know if you're switching or regulating voltage. You see, if there is a number on it, it is voltage regulation, and if not, it may be a power switch.

Looking at your description, you can't guess what it's for. But if you don't know, it's best not to move.

There are several possibilities, one is power regulation. 110v/220v。

One is to open the case cover to give an alarm.

You can call ** and ask Dell

Power switch. Don't move, hehe.

Dizzy! That's the power switch!

In fact, in my opinion, the definition of curvilinear motion: the trajectory of an object is the motion of a curve, which is called "curvilinear motion". When the resultant force exerted on an object is not in the same line as its velocity, the object is moving in a curve.

In curvilinear motion: when the angle between the force vector and the velocity vector is equal to 90°, the force only changes the direction of the object's velocity, but does not change the magnitude of the velocity: for example, uniform circular motion; When the angle is less than 90°, the force not only changes the direction of the object's velocity, but also increases the magnitude of the velocity. When the angle is greater than 90°, the direction of the object's velocity is also changed, but the magnitude of the velocity is reduced.

When the object moves to a certain point in a curvilinear motion, the resultant force on the object can be decomposed into two components, along the direction of velocity and the direction of vertical velocity, where the component along the direction of velocity changes the magnitude of the velocity, and the component of the vertical velocity changes the direction of velocity. The direction of velocity in curvilinear motion is always changing, because it is a vector, and it has both magnitude and direction. Regardless of whether the magnitude of the velocity changes or not, as long as the direction of the velocity changes, it means that the velocity vector changes, and there is acceleration, so the curvilinear motion is a variable speed motion.

Acceleration can also be decomposed into two components, along the direction of velocity and in the direction of vertical velocity, where the component along the direction of velocity describes the speed of the change in magnitude of velocity, and the component in the direction of vertical velocity describes the speed of change in the direction of velocity. The direction of the acceleration of the curvilinear motion is always the same as the direction of the resultant external force. The acceleration itself is caused by the resultant force of the external force on the object When it is equal to 90 degrees, the decomposition force of the force in the direction of velocity is 0, so it does not change the magnitude of the velocity but only changes the direction When it is less than 90 degrees, there is a decomposition force in the positive direction of the velocity, so it can change the magnitude of the velocity, and it will accelerate, and there is also a decomposition force in the vertical direction of the velocity, so it will also change the direction of velocity, and when it is greater than 90 degrees, there is a decomposition force in the opposite direction of velocity, so it can change the magnitude of the velocity, and it will slow down, And there is also a decomposition force in the vertical direction of velocity, so it will also change the direction of velocity Of course, uniform circular motion is not really uniform motion, curvilinear motion is variable velocity motion, and the uniform velocity in uniform circular motion refers to the magnitude of the velocity.

The curvilinear motion is a variable speed motion, and if the combined external force is unchanged, it is a uniform variable speed motion; If the combined external force changes, it is a variable acceleration motion. When the direction of the resultant force experienced by the object is not in the same straight line as the direction of its motion, the object moves in a curve. At the same time, pay attention"Tangents", which we can understand as the velocity of a particle at a certain point, along the tangent direction of the curve at that point.

2 blocks are explained below:

The first time 8 yuan became 9 yuan, and 1 yuan was earned.

The second time, 10 yuan became 11 and earned 1 yuan.

The analysis is as follows: no matter how much money he buys, it is his own principal The difference in payment from the principal to the ** goods is the profit It has always been 1 yuan He only did 2 times of business Even if he bought 100 and sold 101, he also earned 1 yuan.

Purpose of the test of the question:

This question tests your understanding of profit maximization, if he buys 8 yuan and does not sell it, he can earn 3 yuan by selling it directly at 11 yuan, he sells it in advance, and then buys and sells, and earns less, which can be imagined as ** I bought it today, and I bought it tomorrow when it went up, and it turned out to rise on the 3rd day, if he bought it back, he had to wait for the 4th day to decide whether it would still rise to decide whether he could make money again, otherwise he would lose money, then he had been waiting not to sell, and he would earn more if he didn't sell it on the 4th day.

You set her total money to 11

One. 11-8=3

Two. 3+9=12

Three. 12-10=2

Four. 2+11=13

In the end, she has $13 minus her total money in front of her $11 and makes a profit of $2.

You can think of it as two trades, and the goal of the trade is different: the first time you make $1 with a chicken, and the second time you make $1 with a duck, so that's $2 in total.

There is no relationship between $9 and $10, so there's no need to think too much about it.

I lost 2 yuan, I could have earned 3 yuan, but then I only made 1 yuan, so I lost 2 yuan.

The first time selling chicken (9 yuan) - buying chicken (8 yuan) = a1 yuan the second time selling chicken (11 yuan) - buying chicken (10 yuan) = b1 yuan However. Look at the word "again" in the title clearly.

Think about the first chicken after he only had 9 yuan, so how did he buy a chicken for 10 yuan, so he had to paste C1 yuan again, so a1 + b1-c1 = 1 yuan (this is the profit).

So I think the answer is $1!

Start - used 8 (-8), earned 9 (+9)** used 10 (-10), earned another 11 (+11) -8 + 9 - 10 + 11

This question is sent by many people, and it can be understood in 2 times: the first time it was 8 yuan**, 9 yuan was sold, and 1 yuan was earned; The second time I bought it for 10 yuan, sold it for 11 yuan, and transferred it to 1 yuan. He ended up earning a total of $2.

There should be no money

First he spent eight dollars and earned one yuan.

But the second time I spent 10 yuan, I already lost one yuan, and I made 、、、 again