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
参考答案:C
. 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
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