One explanation for the good manners of Swiss shop workers is that _______.
A. they have been educated to do so
B. they understand that the more polite they are, the more customers they will get
C. they can get a bonus for treating customers well
D. they are proud of the service they provide
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Which city or cities ranked the fourth?
A. Berlin.
B. Zagreb.
C. Sao Paulo.
D. All of the above.
What impressed the researchers about the petty criminals in Sao Paulo?
A. They were very polite and friendly to the police.
B. They were not afraid of the police while doing business at the illegal market.
C. They said thanks to customers before fleeing upon the police’s arrival.
D. They sold good-quality sunglasses.
曲轴的常见损伤形式有( )。
A. 磨损(轴向磨损和径向磨损)
B. 变形(弯曲、扭曲)
C. 裂纹
D. 断裂
可以用来测量曲轴轴向间隙的测量工具有( )。
A. 游标卡尺
B. 塞规
C. 百分表
D. 外径千分尺