有线电视系统中，特性阻抗是75Ω时，1W的实际功率换算为电平为（）。A、78.75d

Their performance was much better than_________.

A．expected

B．it expected

C．expecting

D．it is expected

下述论述中不正确的有（）

A．无论气温高低，只要零件的实际尺寸都介于最大、最小极限尺寸之间，就能判断其为合格。

B．一批零件的实际尺寸最大为20．0lmm，最小为19．98mm，则可知该零件的上偏差是十0．01mm，下偏差是—0．02mm。

C．j～f的基本偏差为上偏差。

D．对零部件规定的公差值越小，则其配合公差也必定越小。

E．H7/h6与H9/h9配合的最小间隙相同，最大间隙不同。

阅读理解。

    Mr and Mrs Brown were going abroad for their holiday. They had a dog called Blackie which they were

very fond of, but they could not take him abroad with them, so they looked for a good place to leave him in

while they were away, and at last found a place which looked after dogs very well while their owners were

away. They took Blackie there just before they left for their holiday, and sadly said goodbye to him.

    At the end of their holiday, they got back to England very late at night, and as they thought that the place

where Blackie was staying might be closed at that hour, they decided to wait until the next morning before

going to get him back.

    So the next morning Mr Brown got into his car and drove off happily to collect Blackie.

    When he reached home with the dog,he said to his wife. "Do you know, dear, I don't think Blackie can

have enjoyed his stay at that place very much. He barked all the way home in the car as if he wanted to tell

me something."

    Mrs Brown looked at the dog carefully and then answered, "You are quite right, dear. He was certainly

trying to tell you something. But he wasn't trying to tell you that he hadn't enjoyed his stay at that place, he

was only complaining (抱怨) that you were bringing the wrong dog home. This isn't Blackie!

1. The Browns decided to leave their dog somewhere while they were away because _____. [ ]

A. they were not fond of him any more

B. they did not want to take him with them

C. the dog refused to go with them

D. they were not allowed to take him abroad

2. They _____ before they left for their holiday.[ ]

A. asked a friend to take care of the dog

B. left it to their house keeper

C. took it to an old man who looked after dogs very well

D. found Blackie a good place where dogs were taken care of

3. As the dog _____, he barked all the way. [ ]

A. did not recognize Mr Brown

B. had something to tell his old master

C. had enjoyed his stay at that place

D. knew he was with their masters again

称为"血海"的是（）

A.冲脉

B.督脉

C.带脉

D.任脉

E.阳维脉

中 * * 党的十一届三中全会以来，实现了全党工作中心向( )的转移。

A．民主建设

B．法制建设

C．政治建设

D．经济建设