题目内容

摇臂是一个双臂杠杆，以摇臂轴为支点，两臂不等长。

A. 对
B. 错

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摇臂的功用是（）。

[音频]Listen to a short conversation between a man and a woman. As you listen, decide whether the following statements are true (T) or false (F).1.The man and woman are old friends.

A. 对
B. 错

2.The man has some trouble now.

A. 对
B. 错

3.The woman feels terrible.

A. 对
B. 错