單項選擇題() is not installed on the main switchboar.

A.Ammeter and changeover switch
B.Power factor meter
C.Synchroscope
D.Reverse sequence relay


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1.單項選擇題One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()

A.seal water supply be cut off
B.make up water supply be cut off
C.oil outlet valve closed or not open sufficiently
D.the flow rate of oily water is too much

3.單項選擇題If separating effect is not good, which measure should be taken ()

A.working at intervals and properly heating
B.warming up to 70℃, increase water supply flow
C.improving impulse of water supply
D.reducing water supply flow

4.單項選擇題Engine parameters shall be corresponded to NOx Technical Files. This is required by ()

A.MARPOL Annex Ⅲ
B.MARPOL Annex Ⅵ
C.MARPOL Annex Ⅴ
D.MARPOL Annex Ⅳ

5.單項選擇題Under MARPOL Code the ship to which it applies has to carry ()

A.an International Ship Security Certificate
B.an International Oil Pollution Certificate
C.a Safety Management Certificate
D.an International Ballast Water Management Certificate