题目内容

推杆一般用冷拔无缝钢管制造，两端焊上球头和球座。

A. 对
B. 错

查看答案

搜索结果不匹配？点我反馈

更多问题

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

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