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
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
参考解析
解析：
暂无解析
相关考题：
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AI—III—II—IVBI—II—III—IVCII—I—III—IVDII—I—IV—III
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（）。A0.25MPaB0.27MPaC0.31MPaD不小于12米射程的水柱
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.AslowBquickCarrangedDhigh
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（）.ATBN numberBviscosityCtemperatureDfoaming
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。Aa→b→c→dBa→b→d→cCa→d→b→cDa→c→b→d
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（）.Aa specific barometric pressureBa specific temperatureCa specific wind speedDany time
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（）.Aradio communications that are availableBmaximum speed of your vesselCtemperatureDcurrent
单选题If reefer spaces are not properly cleaned prior to loading cargo，it will most likely cause（）.Amold to develop on commoditiesBmalfunction of the refrigeration equipmentCcontamination of the insulation in the spaceDAll of the above
单选题The annual change in（）is 0.2 degree．AMagnetic VariationBMarine InsuranceCMaritime AccidentDMean High Water Spring
单选题The thermostatic valve has a throttling action, that is to say the valve can（）Astop the refrigerant from flowingBforce the refrigerant to flowCcause the refrigerant pressure to riseDcause the refrigerant pressure to fall
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CA或BD不能工作