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问题 单项选择题

具有功率因数高、节流、平滑控制交流电动机、调速性能优越、节能效果明显等特点的电梯是（）。

A．单速、双速及三速电梯

B．调频调压调速电梯

C．调压调速电梯

D．直流电动机电梯

答案

参考答案：B

补全对话，情景问答

根据所给情景，选择最佳答案。

1. 当你想问别人会不会打扑克时，应说：[ ]

A. Do you like cards?

B. Can you play cards?

C. Do you play cards?

D. Do you like to play cards?

2. 当你想问农场里有什么动物时，应说：[ ]

A. What animals are on the farm?

B. How many animals are on the farm?

C. Do you have many animals on the farm?

D. Where are the animals on the farm?

3. 当你想问别人在哪儿工作时，应说：[ ]

A. Where are you?

B. What do you do?

C. Where are you work?

D. Where do you work?

4. 当你想去动物园，需要问路时，应说：[ ]

A. Thank you.

B. I'm sorry. Where is the zoo?

C. Excuse me! Where is the zoo?

D. Where is the zoo?

5. 当你想问别人发生了什么事时，应说：[ ]

A. What is it?

B. What happened?

C. Where is it?

D. What is happen?
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单项选择题

在搓球时，用拍的下部触球，前臂和手腕向下用力擦击球是（）

A.快搓

B.慢搓

C.搓转球

D.搓不转球
查看答案