單項選擇題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


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2.單項選擇題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

3.單項選擇題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.單項選擇題

Continuous surging of turbocharger can be caused by（）
①crash stop of engine
②increased back pressure after T-Ch
③fouled or damaged turbine nozzle ring

A.all are correct
B.②and③are correct
C.none of the above is correct
D.①only is correct