4 16 All true false, 11 true false

The process of entropy increase is irreversible.

The entropy change of an irreversible process cannot be calculated;

If the working fluid reaches the same final state from a certain initial state through a reversible and irreversible pathway, the irreversible path must be greater than the reversible pathway;

After the working fluid undergoes an irreversible cycle;

The processes in nature are all carried out in the direction of entropy increase, so the process of entropy reduction cannot be realized;

The entropy of the working fluid must increase when it is heated, and the exothermic entropy of the working fluid must decrease.

Answer: (1) Incorrect, only isolated systems can say so;

2) Incorrect, s is a state parameter, which has nothing to do with the process, and can be calculated if you know the initial state and the final state;

3) No, s is the state parameter, which has nothing to do with the process, is equal;

4) No, the working fluid returns to its original state after undergoing both reversible and irreversible cycles, so the entropy becomes zero.

5) No, for example, in the reversible constant temperature compression process of the ideal gas of the system, the system releases heat to the outside and the entropy decreases.

6) The entropy of the working fluid must increase when it is heated, but the entropy does not necessarily decrease when the system is heat-released. If it is a reversible process, the entropy must decrease.

Upstairs is blind, the following answer is for the landlord's reference:

1) Correct. 2) Correct.

3) Incorrect, reversible Carnot cycle.

Absorb heat from the heat source, and release heat to the low temperature heat source while doing work on the outside. The whole process is reversible, but it is still entropy-increasing. Because: there is an entropy flow δsf = δq t

4) Correct. 5) Incorrect, it should be s irreversible = s reversible, sf, irreversible process.

The path experienced is irrelevant. Therefore, when the working fluid goes through no matter what kind of cycle, the change of entropy is 07) incorrect, because entropy is a state function, which is only related to the beginning and end states, and has nothing to do with the specific path, so a reversible path can be designed to find the entropy change.

8) Incorrect, after the working fluid goes through an irreversible cycle, there is dq t<0, but ds=09) is incorrect, in the irreversible process, the entropy of the system may also decrease only for an isolated system, and the entropy of an isolated system will never decrease.

1) Correct. 3: Correct branch pure.

4: Error. Youth should be said to refer to spring, the sentence means: spring has come to the good scriptures, in the birds and flowers with his wife"Companionship""Homecoming"。

False Answer Analysis:

Analysis] Financial management services are not done all at once. Future estimates cannot be completely accurate, the objective environment will continue to change, and the customer's personal economic conditions and financial goals will also change, so it is still necessary for financial planners to constantly adjust the plan according to the new situation for a long time after the completion of the plan.

Nothing can be set in stone and bwrong.

Cylinder, 1: False. The surface area is squared and the volume is cubic.

2: False. It must be equal in height and at the same base.

3: Right. They are all volumes multiplied by the base area.

4: False. Ridge length 1:2. Volume 1:8

5: Right. Refer to question 2.

6: Right. Refer to question 2.

13. a cylinder.

Judgment: Right and Wrong, Right and Wrong, Right and Right.