Which city or cities ranked the fourth?
A. Berlin.
B. Zagreb.
C. Sao Paulo.
D. All of the above.
查看答案
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
曲轴轴颈的磨损可以用（）评价。
A. 圆跳动
B. 平面度
C. 圆度
D. 圆柱度
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