Alifeboatisweighttestedbyloweringtonearthewaterandloadingtocapacitywithweightevenlydistributed.Itisthenloweredintothewaterandreleased.Thistestmustbedoneatleastonceevery（）.
A. 6months
B. 12months
C. 18months
D. 24months
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市场准入系统中在册企业对应的数据库表为（）
A. hz_qyhznr
B. sl_qyhznr
C. bf_qyhznr
D. hz_qymchzk
AccordingtotheCodeofFederalRegulations，onvesselsotherthanriverferryboatsandrivervessels，howareperiodiclifeboatweighttestsrequiredtobeconducted?（）
A. Thelifeboatisloweredtonearthewater，loadedwiththeallowedcapacity，loweredintothewateruntilafloat，thenreleasedfromthefalls
B. Thelifeboatisloadedwiththeallowedcapacity，loweredintothewateruntilafloat，thenreleasedfromthefalls
C. Thelifeboatisloweredintothewateruntilafloat，loadedwiththeallowedcapacity，thenreleasedfromthefalls
D. Thelifeboatisloweredtonearthewater，loadedwiththeallowedcapacity，thenreleasedfromthefalls
Allinflatableliferaftshave（）.
A. safetystrapsfromtheoverhead
B. builtinseats
C. releasinghooksateachend
D. waterstabilizingpockets
事前的信息不对称使得一些优质客户被拒之门外，即经济学中的（）。
A. 道德风险
B. 操作风险
C. 逆向选择
D. 信用风险
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