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问题 单项选择题

电力系统中进行无功补偿可提高（）。

A、负荷率

B、用电量

C、功率因素

D、提高断路器开断短路电流能力

答案

参考答案：C

计算题

如图所示，质量均为m的小车与木箱紧挨着静止在光滑的水平冰面上，质量为2m的小明站在小车上用力向右迅速推出木箱，木箱相对于冰面的速度为v，接着木箱与右侧竖直墙壁发生弹性碰撞，反弹后被小明接住，求小明接住木箱后三者共同速度的大小。
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填空题
根据短文内容,选用方框内的单词填空。
for,   always,   different,   read,   careful,   more,   good at,   quieter,   not,   like to
     My family __1__spends the summer vacation by the beach. Usually we go to Qingdao, but this year
we're going somewhere__2__. We're going to Hainan．My dad says Hainan is __3__than Qingdao,
and he says the beaches are __4__beautiful. My friend Zhao Fei went to Hainan last year and he said it
was a great place __5__swimming. Zhao Fei is really __6__swimming, but I'm __7__. I'm more__8__
than him. I __9__sit on the beach and __10__a book.
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