單項(xiàng)選擇題Which of following functions is not one of the functions of air conditioner?（）

A.refreshing the air
B.making person upset
C.adjusting the air humidity
D.adjusting the air temperature


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1.單項(xiàng)選擇題The oil discharge monitoring system in the oil tanker vessels is used for detecting the amount of oil discharged overboard to ensure that it does not exceed（）

A.15 liters nautical mile
B.30 liters nautical mile
C.60 liters nautical mile
D.100 liters nautical mile

3.單項(xiàng)選擇題Which cause of following will not lead to refrigeration plant short-cycle?（）

A.lack of refrigerant
B.refrigerant with much water
C.set defectively low pressure relay
D.no cooling water

4.單項(xiàng)選擇題On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）

A.centrifugal pump is cheaper than reciprocating pump
B.the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C.centrifugal pump makes maintenance easier than reciprocating pump does
D.all of the above

5.單項(xiàng)選擇題When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）

A.rise quickly
B.rise slowly
C.drop quickly
D.drop slowly

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Flame failure in an automatically fired auxiliary boiler can from a/an （）

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When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

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By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

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The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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Using a file without a handle may result in （）

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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

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