AshipwhichisrequiredtocarryanOilRecordBookmustloginthebook（）.
A. dischargeofballastorcleaningwaterfromfueltanks
B. soundinglevelsofallfueltanksonadailybasis
C. thegradeandspecificgravityofallfueloilcarried
D. fuelconsumptionratesonaweeklybasis
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Analternatorswitchboardhasasynchroscopeandsynchronizinglamps,ifthesynchroscopeisbroken,whichofthestepslistedisthemostessentialbeforeanalternatorcanbeparalleledwiththebus（）
A. Thebreakershouldbeclosedwhenonesynchronizinglampisdarkandtheotherisbright
B. Thebreakershouldbeclosedwhenbothsynchronizinglampsarebright
C. Thefrequencymetershouldbeusedtodeterminethattheincomingalternatorfrequencyisslightlyhigherthanthebus
D. Aportablephasesequenceindicatormustbeusedtoverifytheinformationfromthelamps
WhichofthefollowingstatementsrepresentstheFIRSTprecautiontobetakenpriortoworkingonanyinstalledelectricalcomponent（）
A. Wearrubberglovesandboots
B. Useonlyapprovednon-conductingtools
C. Groundthecaseofthemachinebeforebeginninganyrepairs
D. Openthesupplycircuitsandtagtheswitches
将某种细菌接种到细菌培养基（由一些细菌生长所需的物质组成）上，加盖后，以不同的方式处理，并放置在不同的温度环境中，培养24h后，观察所得结果，列表如下： 根据上述实验结果所作出的下列判断中，错误的是（）
A. 编号a与f比较可知，有细菌则培养基的表面会变混浊
B. 根据编号b和c的观察结果，可知抗生素Y比抗生素X的杀菌能力强
C. 将编号e和f的结果比较可知，0℃的环境不适合细菌生长
D. 若揭开编号f的盖子，24h后可观察到培养基表面会出现混浊
Anemergencygenerator,drivenbyaninternalcombustionengine,shallbetestedunderloadforaminimumof2hoursatleastonceevery（）
A. week
B. 2weeks
C. month
D. 3months
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