题目内容

Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

A. gears
B. rams
C. barrels
D. cam

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试管主要用于（）。

A vessel must proceed at a safe speed（）.

A. in restricted visibility
B. in congested waters
C. during darkness
D. at all time

吸烟对人的心理健康产生消极影响中不包括（）

A. 自制力变差
B. 注意力涣散
C. 记忆力减退
D. 反应迟钝

碳箱的作用是防止（）的燃油蒸汽对大气的污染。