In some designs the cylinder oil is timed so that the oil in

【名词&注释】

平均值(average)、数学期望值(mathematical expectation)、平均寿命(average life)

[单选题]In some designs the cylinder oil is timed so that the oil injects only on the （）.

A. piston crown
B. piston groove
C. piston skirt
D. piston ring belt

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[单选题]平均寿命E（t）是个箅术平均值，在概率中称（）。Ⅰ.数学期望值；Ⅱ.均值

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]备车时间的长短，各类船舶有所不同，一般在（）h。

A. 0.5—6
B. 1—2
C. 2—3
D. 1—5

[单选题]On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.

A. the camshaft
B. the flange
C. the ridge
D. the bulge

[单选题]On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.

A. banjo feed
B. splash feed
C. gravity feed
D. pressure feed

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