It was clever __ at the answer in two minutes.
A.of him to arrive
B.for him to arrive
C.for his arriving
D.of his arriving
第3题
GB8408-2008《游乐设施安全规范》规定:卷筒和滑轮用的钢丝绳,宜选用()钢丝绳。
A.线接触
B.点接触
C.面接触
第9题
绕经滑轮和卷筒的机构工作钢丝绳应优先选用 .
A.点接触钢丝绳
B.线接触钢丝绳
C.面接触钢丝绳
D.顺绕钢丝绳
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