In Asia, people usually ______ when they greet each other.
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In America, people shake hands in a _____ way.
A. soft
B. firm
When you meet someone, you could say:
A. Pleased to meet you.
B. Nice to meet you.
C. How are you?
D. It was nice meeting you.
People should be polite in face of different customs.
A. 对
B. 错
达•芬奇绘制的防御机器人里用到的机械传动机构有()
A. 带轮传动
B. 圆柱直齿轮传动
C. 斜齿轮传动
D. 链传动
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