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问题 不定项选择
为了监测变电站向外输电的情况，要在变电站安装互感器，其接线如图所示，两变压器匝数分别为n1、n2和n3、n4，a和b是交流电表。则（   ）
A．n1＜n2

B．n3＞n4

C．a为交流电流表，b为交流电压表

D．a为交流电压表，b为交流电流表

答案

答案：D

补全对话，情景问答

Read and choose.

A. What did you do yesterday?

B. How did you go there?

C. What day is it today?

D. What did you do there?

E. What day was it yesterday?

F. Did you play computer game with your cousin?

G. Yes, I did.

A: 1.                                     ?

B: It was Saturday.

A: 2.                                     ?

B: I went to visit my cousin.

A: 3.                                     ?              

B: I went by bike.

A: 4.                                     ?            

B: I played computer games with my cousin.

A: Did you eat good food in you cousin's home?

B: 5._                                   . It was delicious.
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选择题

“蹦极”是一项非常刺激的体育运动．如图所示，某人身系弹性绳自高空P点自由下落，图中的a点是弹性绳的原长位置，c点是人所能到达的最低位置，b点是人静止悬吊着时的平衡位置．人在从P点下落到最低位置c点的过程中，下列说法不正确的是（　　）

A．在Pa段人做自由落体运动，处于完全失重状态

B．在ab段人所受弹性绳的拉力小于人的重力，人处于失重状态

C．在bc段人所受弹性绳的拉力大于人的重力，人处于超重状态

D．在c位置，人的速度为零，处于平衡状态
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