某一钢丝绳的破断拉力为208kn,用作滑轮组的跑绳时,其最大允许拉_爱下问搜题

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问题单项选择题

某一钢丝绳的破断拉力为208kn,用作滑轮组的跑绳时,其最大允许拉力为()。

A.20.8kn

B.34kn

C.41.6kn

D.59kn

答案

参考答案：C

选择题

. Yesterday I missed my feet on the stairs and had a bad fall. Luckily it was nothing serious ___.

A．however

B．therefore

C．also

D．though

单项选择题

不透明的瓷涂层面厚度要求在

A．0.3～0.4mm

B．0.25～0.3mm

C．0.2～0.25mm

D．0.05～0.1mm

E．0.1～0.2mm