Which of the following is true? Which of the following is true?

Which of the following is true:

a.If a signal is defined as an edge-sensitive clock signal, the corresponding statement must be given in the list of sensitive signals.

b.If a signal is defined as a level-sensitive asynchronous control signal corresponding to a clock, the logical behavior of the signal must be specified in the always process structure.

c.If a signal is defined as a synchronous control signal corresponding to a clock, it must never appear in any form in the sensitive signal table.

d.Mixed signals can appear in the list of sensitive signals.

Correct answer: If a signal is defined as an edge-sensitive clock signal, the corresponding statement must be given in the list of sensitive signals; If a signal is defined as a level-sensitive asynchronous control signal corresponding to the cooker clock, the logical behavior of the signal must be clearly stated in the always process structure; If a signal is defined as a synchronous control signal that responds to the clock for hidden start-up, it must never appear in any form in the sensitive signal table.

Answer]: C This question examines the relationship between the composite index and the total index, and the index is divided into the composite index and the average index according to different compilation methods, and the composite index is the basic form of the total index. The hall is open.

Answer]: B Solution: A is false.

The conditions for the formation of hydrogen bonds are: after the hydrogen atom forms a strong polar covalent bond with an atom with large electronegativity and a small radius with lone pairs, it can also attract the clear lone pair of electrons in another atom with greater electronegativity to form a hydrogen bond. The only atoms that meet this condition are atoms such as O, N, F, etc., so not all hydrogen-containing compounds have hydrogen bonds.

b correct. There is an orientation force between polar molecules only. Of course, in addition to the orientation force, there are also dispersion forces and induction forces between polar molecules. In some polar molecules containing hydrogen, there may also be hydrogen bonds before collapse, such as HF and H2O.

c error. Only non-metal atoms with high electronegativity (such as atoms of group A elements) and metal atoms with low electronegativity (such as atoms of group A elements) form compounds, and their crystals are detached balancer crystals. H and Cl are both non-metallic elements, and they are combined by covalent bonds to form covalent compounds, and their crystals are molecular crystals.

After HCl is dissolved in water, HCl is dissociated into H+ and Cl- due to the action of water molecules.

d error. According to Pauling's rule: the greater the number of oxygen atoms (n) in an oxygenated acid that does not bind to hydrogen, the more acidic it is. Therefore, the order of acidity from strong to weak is HCO4> H2SO4 > H2SO3.

So the correct answer is b.

Which of the following says that serving the law is the correct number of socks?

a.During the experiment, look for an arbitrary value of the charge equilibrium voltage between 0-400.

b.The balance voltage is between 200 and 300V.

c.To measure, select oil droplets with a fall time of 8 to 10 seconds.

d.When measuring, choose oil droplets that move very slowly.

Correct answer: The balanced voltage is between 200 and 300V.

a.When you sweep the solids with the default option, the section shape is moved and adjusted to be perpendicular to the path, and the centroid of the section beam is aligned with the start of the path.

b.When the solid is swept with the default option, the slag roll section shape is swept in its original orientation, and the centroid of the section shape is not aligned with the start of the path.

Correct Answer: a

Which answer is correct.

Answer: 32 98 = 3136, choose C to defeat the lead.

From the single digits, it is possible to quickly judge the judgment and draw conclusions.

iIntelligent Q&A.

Question: Which of the following answers is correct 32 98=? [A 2636 Imitation B 3456 C 3136.]

The answer is Zhijuxian:

c Analysis: 32 98= 3136, choose C before answering.

Analysis: Answer: C Analysis: 32 98= 3136, choose C

Options A and B can be either non-faceted lines or intersecting lines.

c There is only one point outside the straight line, and if it is inside the straight line, it is zero straight line.

d This unwanted straight line can also be a straight line on the opposite plane, not necessarily a parallel line.

b The two straight lines are parallel to the straight line, and the two straight lines are also parallel. This is an axiom.

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You are right.

a Although carbon dioxide is CO2, it is not made of oxygen and carbonb This topic is to remember that (one) carbon dioxide molecule is made up of one carbon (atom) and two oxygen (atoms).

c Molecules are made up of atoms, so it's not right.

d Carbon dioxide is composed of carbon and oxygen.

The carbon dioxide molecule is made up of carbon atoms and oxygen atoms.

Regarding the electric displacement lines in the electrostatic field, the following statement is true () aStarts from a positive charge, ends with a negative charge, does not form a closed line, does not interrupt bAny two electrical displacement lines are parallel to each other cIt comes from righteousness and freedom.

c！Not all quadrilaterals have four vertices on the same circle, with a few exceptions: rectangles, squares, equilateral trapezoids. The four vertices of these special quadrilaterals can all be on the same circle.