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【简答题】
(20分) 如图所示,两块金属板用两个 M12 的普通螺栓连接。若结合面的摩擦系数f=0.3 ,螺栓预紧力控制在屈服极限的 70% ,螺栓用性能等级为 4.8 的中碳钢制造,求此连接所能传递的最大横向载荷F 。
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【简答题】___________ 1. That's good. Could you hold on a second while I get a pen? ___________ 2. Sorry, Bernard, I didn't catch that. Could you slow down a little, please? I need to take some notes. _________...
【单选题】Speaker A： May I speak to Dr. Wang, please? Speaker B：_________.
A.
Hold on a second, please. I’ 11 put him on.
B.
Sorry, Mr. Wang is not available right now.
C.
I am not sure because I don, t know what he is doing.
D.
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【简答题】牛顿流体是指
【单选题】W: _________, please? M: Oh, hold on a second. I ’ ll check for you.
A.
Who ’ s that
B.
Glad to meet you
C.
This is John
D.
May I speak to Betty
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