Of a kind of liquid is used to cool the diesel engine, it is

【名词&注释】

轴系理论中心线

[单选题]Of a kind of liquid is used to cool the diesel engine, it is invariably called （）

A. lubricant
B. coolant
C. combustion product
D. second refrigerant

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学习资料：

[单选题]对使用液压撑杆螺栓的正置式主轴承，因其一端顶在轴承盖上，另一端顶在机架上，所以在上紧贯穿螺栓之前，必须先（）的撑杆螺栓。

A. 上紧全部
B. 上紧相应
C. 松开全部
D. 松开相应

[单选题]轴系理论中心线是船舶（）时所确定的轴系中心线。

A. 设计
B. 制造
C. 安装
D. 轴系校中

[单选题]当铁梨木艉轴承产生裂纹或开裂时，可采用（）方法修理。

A. 换新
B. 局部换新
C. 上、下瓦对调
D. 换新或局部换新

[单选题]The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.

A. repeatedly
B. quickly
C. gradually
D. immediately

[单选题]The piston supporting body is mainly subjected to （） stress.

A. pushing
B. centrifugal
C. stretch
D. compressive

[单选题]Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.

A. fuel oil vapor at the sludge tank vent
B. unburned fuel vapors in the scavenge air receiver
C. lube oil vapors in the crank case
D. lube oil vapors in the engine room

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.

A. scavenging action of the piston
B. piston type vacuum pump taking suction off a differential manometer
C. gland exhausting manometer
D. crankcase exhaust fa

[单选题]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.

A. slight acidity
B. slight alkalinity
C. excessive alkalinity
D. excessive acidity

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