All three systems have the ports （） to swirl the incoming

【名词&注释】

润滑油(lubricating oil)、液压油(hydraulic oil)、准备工作(preparation work)、轻柴油(light diesel oil)、小范围(small range)

[单选题]All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.

A. angled
B. rounded
C. being angled
D. being rounded

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学习资料：

[单选题]在有充分氧气存在时，烟垢的可燃成分在高温下自由蒸发，被火花或火焰点燃，在废气锅炉烟道内保持小范围^{(small range)}和有限的火源，称为（）。

A. 高温着火
B. 氢着火
C. 铸铁着火
D. 小的烟垢着火

[单选题]液压拉伸器的液压系统中除应使用纯净的液压油外，还可使用（）作为液压油。

A. 润滑油
B. 轻柴油
C. 透平油
D. 高级润滑油

[单选题]滑油系统的备车准备工作应检查（）。Ⅰ.循环油柜油位；Ⅱ.轴承油位；Ⅲ.储油柜油位；Ⅳ.分油机

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅰ+Ⅳ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]In a four-stroke engine the camshaft rotates at （）.

A. half the engine speed
B. twice the engine speed
C. the engine speed
D. four times the engine speed

[单选题]The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.

A. the connecting rod
B. the cross-head
C. the piston rod
D. the air box

[单选题]The procedures recommended for auxiliary boilers having high salinity include （）.

A. treating with oxygen scavengers
B. securing the boiler and giving it a blowing down
C. increasing the pH
D. reducing the phosphate level

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