Whichwordindicatescolorvariationinthecharacteristicsofalight?（）
A. Opposing
B. Changing
C. Reversing
D. Alternating
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ACandDCgeneratorsaresimilarinthatthey（）
A. bothgeneratealternatingvoltages
B. bothrectifythevoltagebeforedelivery
C. areconstructedatthesamephysicalsizeforthesamekilowattrating
D. bothsupplythree-phasepower
TheSafetyRadioCertificatefortheCargoShipisissued（）.
A. bytheRadiotelegraphyAuthorityofacountry
B. inaccordancewiththeGovernmentRegulations
C. bycomplyingwiththeProvisionsoftheNationalConventions
D. undertheProvisionsoftheSOLASConvention
Whichofthefollowingdevicesareprotectedfrombeingmotorizedbyareverse-powerrelay?（）
Alternators
B. Waveguides
C. Exciters
D. Amplidynes
TheSafetyEquipmentCertificateshowsthatthevesselconformstothestandardsofthe（）.
A. MSA
B. AmericanBureauofShipping
C. AmericanSalvageAssociation
D. SOLASConvention
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