试题与答案

折梯使用时上部夹角以()为宜,铰链必须牢固,并应有可靠的拉撑措施。 A.30°~40

题型:单项选择题

题目:

折梯使用时上部夹角以()为宜,铰链必须牢固,并应有可靠的拉撑措施。

A.30°~40°

B.35°~45°

C.35°~50°

D.40°~60°

答案:

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     All over the world people enjoy sports. Sports help people to keep healthy, happy and to live longer.

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