【名词&注释】
二冲程(two-stroke)、进排气阀(inspiration exhaust valve)、质量比(mass ratio)、四冲程柴油机(four-stroke diesel engine)、救生衣(life jacket)、时间比(time comparison)
[单选题]The stevedores are going to load your ship in ________ days
A. few
B. a few
C. little
D. a little
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举一反三：
[单选题]下列关于四冲程柴油机工作特点的说法，哪一项是错误的()
A. 换气质量比二冲程好
B. 进排气过程时间比(time comparison)二冲程的长
C. 进排气阀的开启角都大于180°曲轴转角
D. 每完成一个循环，曲轴回转一周
[单选题]One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is
A. seal water supply be cut off
B. make-up water supply be cut off
C. oil outlet valve closed or not open sufficiently
D. the flow rate of oil is too much
[单选题]穿着救生衣(life jacket)的人能使身体后倾仰浮，把脸面浮出水面，嘴离水面至少：
A. 8厘米
B. 10厘米
C. 12厘米
[单选题]四冲程柴油机的压缩和膨胀冲程所对应的曲柄转角是()
A. 压缩冲程小于180°
B. 膨胀冲程大于180°
C. 均大于180°
D. 均小于180°
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