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【单选题】
You are meeting the CEO of your company, and you are so nervous that you find your palms are sweaty when you see him walking towards you and extending his hand to you. So what should you do?A.
Step forward to say Hello with confident smile and shake hands with him.
B.
Before shaking hand, subtly dry your own hand against the side of your pants or skirt.
C.
Refuse to shake hands with him. Apologize and explain the reason sincerely.
D.
All the above behaviors are improper.
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【简答题】Questions 19 to 21 are based on the passage you have just heard. 第19题：
【简答题】19-22Questions 19 to 22 are based on the conversation you just heard. 第19题：
【单选题】以下关于工程中的常见约束的说法中，错误的是
A.
柔绳约束与链条约束类似，约束力只能沿着绳索的方向背离被约束的物体；
B.
光滑铰链约束和光滑球铰链约束本质上都是光滑接触约束，约束力其实只有一个；
C.
光滑接触面约束对应的约束反力，其方向沿着接触处的公法线而指向被约束的物体；
D.
光滑圆柱铰链约束包含向心轴承、活动铰链支座、固定铰链支座、光滑球铰链等。
【简答题】19-21 Questions 19 to 21 are based on the conversation you just heard. 第19题：
【简答题】A÷18=B…19______．