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单选题
在构成电机的材料中,最薄弱、在很大程度上也是决定电动机使用寿命的材料是()材料。
A
导电
B
铁磁
C
绝缘
D
其他非电工
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单选题()means any person by whom or in whose name a contract of carriage of goods by sea has been concluded with a shipper.A
ChartererB
ConsigneeC
ConsignorD
Carrier
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单选题大型低速二冲程柴油机的活塞由以下部件组成()。 Ⅰ.活塞头 Ⅱ.活塞裙 Ⅲ.活塞销 Ⅳ.活塞杆 Ⅴ.柔性螺栓 Ⅵ.十字头A
Ⅰ+Ⅱ+Ⅳ+ⅤB
Ⅱ+Ⅲ+Ⅳ+ⅥC
Ⅱ+Ⅲ+Ⅳ+ⅥD
Ⅱ+Ⅲ+Ⅴ+Ⅵ
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单选题If you were operating a centrifugal water service pump with worn wearing rings, the ().A
pump would be very noisyB
pump would vibrate excessivelyC
pump would develop insufficient flowD
stuffing box would leak excessively
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单选题根据ISPS规则的有关规定,以下哪种情况不能视作船舶的保安薄弱环节()。A
由于疲劳而不能保持有效的保安警戒B
能有效地控制接近和进入船舶C
通过换证审核后的船舶不能立即获得新的国际船舶保安证书D
不能及时获得公司和其他外部的支持
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单选题电离层特点是()①对频率高的无线电波吸收大,因此传播距离近②对频率低的无线电波吸收大,因此传播距离近③电离层浓度高,静区大④电离层浓度低,静区大⑤通常白天电离层浓度高,晚上低⑥晚间.白天电离层浓度不变A
②③⑤B
③⑤⑥C
①③⑤D
②④⑥
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单选题According to the ISPS Code, for a sailing ship, the following except()should be onboard.A
a ship security planB
a ship security officerC
a company security officerD
certain onboard equipments
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单选题建立船舶定线制的目的在于增进()()中船舶的航行安全. Ⅰ、船舶汇集水域 Ⅱ、船舶通航密度大的水域 Ⅲ、由于水域有限而船舶活动自由受到约束、存在障碍物、水深受限或气象条件差的水域 Ⅳ、《国际海上避碰规则》不适用的水域A
Ⅱ、B
Ⅱ、ⅢC
Ⅰ、Ⅱ、ⅢD
Ⅰ、Ⅱ、Ⅲ、Ⅳ
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单选题A reciprocating pump belongs to () according to its working principle.A
injector pumpsB
positive displacement pumpsC
centrifugal pumpD
centripetal pumps
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单选题目前船用柴油机喷油泵使用的可变喷油定时(VW)机构采用以下结构形式()。 ①Vn凸轮机构; ②特殊形状的套筒回油孔; ③定时齿条机构; ④特殊形状的操纵手柄; ⑤特殊形式的进油阀; ⑥柱塞头部特殊的线型。A
②+③+⑤B
①+③+⑥C
①+④+⑥D
②+④+⑥
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单选题Under the provisions of applicable international conventions, ships entitled to fly the flag of a Party are subject, while in the port of a Party, to control by officers duly authorized by the Party Ships of non-parties or below convention size shall be given ().A
more favorable treatmentB
less favorable treatmentC
no more favorable treatmentD
the most favorable treatment
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单选题An electronic depth finder operates on the principle that().A
radio signals reflect from a solid surfaceB
sound waves travel at a constant speed through waterC
radar signals travel at a constant speed through waterD
pressure increases with depth
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单选题Please give us your quotations ()you receive the additional repair list.A
as soon asB
as well asC
as soon as possibleD
as early as possible
考题
单选题某船排水量为23476t,水线面面积关于纵轴的惯性距为86709m4,所在海域的水密度为1.000g/cm3,则该轮的横稳性半径为()m。A
3.99B
3.69C
3.54D
3.16
考题
单选题轮机长在管理工作中应负责()。 a.推进系统的管理; b.贯彻执行船舶预防检修体系; c.机舱日常工作的领导和安排; d.监督燃润物料和备件的合理使用。A
a+dB
b+dC
a+b+dD
b+c+d
考题
单选题A relative bearing is always measured from().A
true northB
magnetic northC
the vessel's beamD
the vessel's head
考题
单选题吊货钢丝绳通常选用()或()钢丝绳。A
半硬;软B
硬;半硬C
软;硬D
半硬;硬
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