管式桅杆单面受力，其中心线与地面夹角不小于（）。A.60° B.70_爱下问搜题

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问题单项选择题

管式桅杆单面受力，其中心线与地面夹角不小于（）。

A.60°

B.70°

C.80°

D.90°

答案

参考答案：C

选择题

My grandfather would be fine for a while, but would then fall suddenly ill and have to_______ the hospital.

A．be admitted to

B．be admitted as

C．be put into

D．be put up

问答题简答题

身体运动的构成要素有哪些？