Engine coolant accumulating in the diesel engine lubricating oil can result from a （）

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  A . reciprocating B . rotating C . running D . removing

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• When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）

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  A . acidity of the oil B . pour point of the oil C . flash point of the oil D . viscosity of the oil

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• The device used to limit engine torque at various engine speeds is called a （）

  A . speed limiting governor B . variable speed governor C . constant speed governor D . load limiting governor

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• After the engine is warned, we should（） the turning gear before starting up the engine.

  A . take in B . put in C . take out D . put u

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• If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）

  A . immediately open all crankcase relief ports B . increase crankcase exhauster speed to draw cool air into the engine C . allow the engine to cool naturally D . increase crank case scavenge air to remove unburned gase

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• Before starting an engine by air, the engine must（）

  A . be turned by a turning gear for at least one minute B . be turned by a turning gear for at least two minutes C . be turned at least one complete turn D . be turned at least two complete tur

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• If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

  A . a broken shaft on the freshwater pump B . an excessive accumulation of scale exchanger C . an incorrect thermostatic element operating range D . lube oil in the cooling water

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  A . cross-head B . cylinder C . connecting rod D . spark plug

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• 请找出下列数控屏幕上菜单词汇的对应英文词汇SPINDLE____、EMERGENCYSTOP____、FEED____、COOLANT（）。

  A . A、主轴； B . B、冷却液； C . C、紧停； D . D、进给

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• 数控设备屏幕上的英文词汇COOLANT、SPINDLE、FEED、JOG对应的含义是：（)。

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