單項選擇題The abbreviation ‘M/E’ is used to represent the（）
A.measure equipment
B.main electrical
C.my engine
D.main engine
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1.單項選擇題Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.
A.a sea water chest
B.a change-over chest
C.a buffer tank
D.a three-way valve
2.單項選擇題The switchboards are those in which all the live parts are installed behind the panels and only the operating handles and instruments are on the front（）
A.open
B.open front type
C.live front type
D.dead front type
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