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单选题
无线电信号书修改资料作为修改无线电信号书之用，它每（）出版一次.
A
一周
B
二周
C
三周
D
一月
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考题
单选题请指出SSA应按以下什么样的步骤进行。（）I、船舶保安威胁风险评估；II、识别船舶保安薄弱环节；III、制订船舶保安计划；IV、策划减轻风险措施A
I—III—II—IVB
I—II—III—IVC
II—I—III—IVD
II—I—IV—III
考题
单选题SOLAS公约规定，1000总吨及以上但小于6000总吨的货船，在两台消防泵同时工作时，在所有消防栓处应维持的最低压力是（）。A
0.25MPaB
0.27MPaC
0.31MPaD
不小于12米射程的水柱
考题
单选题On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.A
slowB
quickC
arrangedD
high
考题
单选题Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.A
TBN numberB
viscosityC
temperatureD
foaming
考题
单选题电液式各种主动式减摇装置的控制原理是（）。 a．敏感元件感受的船舶摇摆信号； b．控制机构将信号放大； c．推动减摇机构动作，产生减摇力矩； d．动力元件的伺服机构输出必要的功率。A
a→b→c→dB
a→b→d→cC
a→d→b→cD
a→c→b→d
考题
单选题Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.A
a specific barometric pressureB
a specific temperatureC
a specific wind speedD
any time
考题
单选题The Rules state that certain factors are to be taken into account when determining safe speed. One of the factors is the（）.A
radio communications that are availableB
maximum speed of your vesselC
temperatureD
current
考题
单选题If reefer spaces are not properly cleaned prior to loading cargo，it will most likely cause（）.A
mold to develop on commoditiesB
malfunction of the refrigeration equipmentC
contamination of the insulation in the spaceD
All of the above
考题
单选题The annual change in（）is 0.2 degree．A
Magnetic VariationB
Marine InsuranceC
Maritime AccidentD
Mean High Water Spring
考题
单选题The thermostatic valve has a throttling action, that is to say the valve can（）A
stop the refrigerant from flowingB
force the refrigerant to flowC
cause the refrigerant pressure to riseD
cause the refrigerant pressure to fall
考题
单选题有四个柱塞式转舵油缸的舵机如斜对角一对油缸损坏漏油，则（）。A
用单泵及蓁两缸工作B
用双泵及其余两缸工作C
A或BD
不能工作
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