WhatistheperiodofvalidityoftheSOLASrequiredCargoShipSafetyConstructionCertificate?（）
A. 12months
B. 24months
C. 48months
D. 60months
AshiprequiredtocarryanOilRecordBookmustmaintainthebookonboardfor（）.
A. oneyear
B. twoyears
C. threeyears
D. fouryears
AshipwhichisrequiredtocarryanOilRecordBookmustloginthebook（）.
A. dischargeofballastorcleaningwaterfromfueltanks
B. soundinglevelsofallfueltanksonadailybasis
C. thegradeandspecificgravityofallfueloilcarried
D. fuelconsumptionratesonaweeklybasis
Analternatorswitchboardhasasynchroscopeandsynchronizinglamps,ifthesynchroscopeisbroken,whichofthestepslistedisthemostessentialbeforeanalternatorcanbeparalleledwiththebus（）
A. Thebreakershouldbeclosedwhenonesynchronizinglampisdarkandtheotherisbright
B. Thebreakershouldbeclosedwhenbothsynchronizinglampsarebright
C. Thefrequencymetershouldbeusedtodeterminethattheincomingalternatorfrequencyisslightlyhigherthanthebus
D. Aportablephasesequenceindicatormustbeusedtoverifytheinformationfromthelamps
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