正弦交流电路中的三种电功率是（）功率、（）功率和（）功率。_爱下问搜题

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问题填空题

正弦交流电路中的三种电功率是（）功率、（）功率和（）功率。

答案

参考答案：视在；有功；无功

单项选择题

再沸器是静置设备中的（）。

A.反应设备

B.分离设备

C.换热设备

D.过滤设备

完形填空

Sometimes things happen beyond expectation. A 10-year-old boy decided to study Judo（柔道） __1__ he had lost his left arm in a car accident. He began his __2_ with an old Japanese Judo teacher. He was doing well, but he could not __3__ why the teacher had taught him only one move for quite a long time.
“Sir,” the boy finally said, “I think I should __4__ more moves.”
“But this is the __5__ move you will ever need to know,” the master replied.
Not quite understanding, the boy kept __6__. Several months later, the teacher __7__ the boy to his first tournament（锦标赛）. __8__ himself, the boy easily won his first two matches. The third match proved to be more __9__. However, after some time, the opponent（对手） became impatient. The boy used his one move to __10__ the match. Now the boy was in the finals.
This time, his opponent was bigger, stronger and more __11__. Concerned that the boy might get __12__, the referee(裁判) wanted to stop the match.
“No,” the teacher __13__, “let him continue.”
Soon his opponent made a mistake. __14__ the boy used his move to attack him. The boy won the match and became the champion.
On the way home, the boy and the teacher __15__ every move in every match. Then the boy asked __16__was really on his mind. “How did I win the tournament __17__ only one move?”
“You won for two reasons,” the teacher answered. “First, you’ve __18__ one of the most difficult moves in Judo. And second, the only known __19__ for that move is to grasp your left arm. But you’ve lost it.” The boy’s biggest __20__ had become his biggest strength.

A．Disappointing

B．Frightening

D．experienced

D．Immediately