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单选题
电动往复泵流量不均匀是因为（）。
A
转速太快
B
转速太慢
C
转速不均匀
D
都不是
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单选题The piston supporting body is mainly subjected to （） stress.A
pushingB
centrifugalC
stretchD
compressive
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单选题A vessel would be referred to as tender when the weight of the cargo is（）.A
evenly distributed vertically and the double bottoms are fullB
concentrated low and the double bottoms are emptyC
concentrated low and the double bottoms are fullD
concentrated high and the double bottoms are empty
考题
单选题Several merchant ships are arriving at the scene of a distress incident. One of the them must assume the duties of the Coordinator Surface Search (CSS). Which of the following statements is TRUE?（）.A
CSS duties are always assumed by passenger vessels，dry cargo vessels，or tankers in that order of precedenceB
The CSS must be established by mutual agreement between the ships concernedC
A tanker should never be assigned CSS duties unless only tankers are presentD
The first vessel to arrive at the distress incident is designated as the CSS
考题
单选题The function of a rectifier is similar to that of a （）.A
trapB
regulating valveC
check valveD
filter
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单选题船上常用来装载压载水、淡水、燃料的液体舱柜有：（） ①、首尖舱；②、尾尖舱；③、双层底；④、深舱；⑤、隔离空舱A
①、②、③、④B
②、③、④、⑤C
①、③、④、⑤D
①、②、④、⑤
考题
单选题船舶开航前，三副应做好的下列哪项准备工作有误？（）A
检查船上所有风筒的档风闸是否活络B
检查船上所有消火栓是否活络C
确保吊艇设备技术状况良好D
每航次开航前都应重新填写《船舶应变部署表》，交大副审核，船长签署
考题
单选题Safety shackles are fitted with（）.A
a threaded boltB
a round pin，with a cotter pinC
a threaded bolt，locknuts，and cotter pinsD
round pins and locknuts
考题
单选题值班驾驶员在航行中发现有人落水，首先应：（）A
抛下救生圈，鸣放人员落水信号，报告船长B
立即停车，并向落水者相反一舷操舵C
抛下救生圈，并采取措施，避免车叶打伤落水人员D
停车，倒车，就近抛下救生圈
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单选题Which of the listed conditions can be considered as the single greatest cause of accidents?（）A
SpeedB
Excessive knowledge or skillC
Human errorD
Excitement
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单选题某船用户在F站终端上若连续键入00870341219086#，则可知它在呼叫航行在某洋区的某一（）用户进行（）通信。A
B船站；电话B
C船站；电传C
M船站；传真D
B船站；电传
考题
单选题柴油机滑动轴承正常工作时的润滑状态为（）。A
边界润滑B
液体润滑C
混合润滑D
不一定
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