单选题惰性气体发生装置生产的惰性气体任何时候含氧量都不得()A超过5%容积B超过5%重量C超过8%容积D超过8%重量
单选题
惰性气体发生装置生产的惰性气体任何时候含氧量都不得()
A
超过5%容积
B
超过5%重量
C
超过8%容积
D
超过8%重量
参考解析
解析:
暂无解析
相关考题:
单选题关于“能见度不良”的说法不正确的是:() Ⅰ、能见度不良是指伸手不见五指的黑夜 Ⅱ、 能见度不良是指由于任何原因,致使两船无法用视觉相互看见 Ⅲ、能见度不良是指由于雾,霾,雨雪等原因使能见度受到限制因而使船舶无法用视觉看到他船的情况AⅠBⅠ、ⅢCⅡ、ⅢDⅠ、Ⅱ、Ⅲ
单选题燃油中含硫对柴油机的危害主要是()。 ①腐蚀燃油系统和设备; ②影响燃油雾化; ③产生低温腐蚀; ④加速碳氢化合物聚合结炭; ⑤破坏正常发火; ⑥影响柴油机换气质量。A①+②+③B①+④+⑤C①+③+④D②+⑤+⑥
单选题根据罗宾逊图可知,船舶在紧急倒车时,螺旋桨推进特性线的变化分为3个阶段,分析第一阶段的变化()。 a.主机转矩迅速下降为0; b.转速在迅速下降; c.出现水涡轮阶段; d.螺旋桨转矩按等航速推进特性曲线下降; e.增压器会出现喘振。Aa+b+c+eBa+b+eCa+b+d+eDa+b+d
单选题Instead of whipping an end of a line,a temporary means of preventing the line from unraveling is to tie a().Abecket bendBblackwall hitchCfigure-eight knotDsquare knot
单选题Where a charter-party specifies the estimated time of arrival of a vessel at the port of loading,there is()obligation on the shipowners to sail to there on the date on which when proceeding with all convenient speed it would normally reach the port on or about the estimated date of arrival.Aan optionalBa reasonableCan absoluteDrational
单选题The water level in the gauge glass when a boiler is operating is () when the boiler is shut down.Alower thanBhigher thanCbelowDequal to
单选题根据我国《船载危险货物监管规定》,载运危险货物的船舶()的表述有误。A在航行、停泊、作业时应当按规定显示信号B与其他船舶相遇时,应当按照航行和避碰规则,尽早采取让路行动C在VTS中心控制的水域,应当按照规定向VTS中心报告D可接受VTS中心提供的水上交通安全信息服务
单选题Positive displacement, helical gear pumps are well suited for pumping oil because ()Astuffing boxes eliminate the leakage problems usually associated with other gear pumpsBit is not necessary to closely maintain design clearances with this pumpCthey are essentially self-priming and produce a high suction liftDthese pumps are designed with extreme tooth angled
单选题The crank-room cover should not be opened until at least () minutes after the engine stops.AoneBfifteenCsixtyDninety
单选题Fuels of high quality with their earlier ignitions will cause higher ()pressure in cylinders of a diesel engine.AcompressionBmaximumCratedDoil
单选题我国现行《海船船员值班规则》规定,所有参加值班的船员应有一定的休息时间,休息时间可以分开,但不超过两段时间,其中一段时间至少要有()小时:连续休息时间段之间的间隔不应超过()小时。A6;14B6;12C6;10D8;10
单选题How can the Coast Guard determine that a crew member is “able to understand any order spoken by the officers”?()ARequire a demonstration by the officer and the crew memberBRequire a written testCRequire that an interpreter be providedDAll of the above