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单选题
利用石英、钛酸钡的()效应产生超声波.
A
正压电
B
逆压电
C
集肤
D
电磁
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单选题互见中,下列说法正确的是:() Ⅰ、机动船在航时应给所有从事捕鱼的船舶让路 Ⅱ、根据良好船艺的要求,机动船在航时不仅应让清所有从事捕鱼的船舶,而且还应让清其所使用的渔具 Ⅲ、从事捕鱼的船舶不应妨碍其他船舶的安全航行A
ⅠB
Ⅰ、ⅢC
Ⅰ、Ⅱ、D
Ⅰ、Ⅱ、Ⅲ
考题
单选题At the required fire drill conducted aboard a vessel, all person must report to their stations and demonstrate their ability to perform the duties assigned to them().A
by the toolpusherB
in the station billC
by the person conduction the drillD
at the previous safety meeting
考题
单选题我国1999年颁布的《船舶与海上设施法定检验规则》规定,如换证检验到期,船舶不在预定检验的港口,经主管机关认可,可将证书给予()展期,短途旅行的船舶经认可后,可给予()展期。A
5个月;3个月B
3个月;1个月C
3个月;15天D
5个月;1个月
考题
单选题汽轮机动力装置的优点是()。 Ⅰ.运转平稳、振动轻、噪声小; Ⅱ.单机功率大; Ⅲ.燃用劣质油成本低; Ⅳ.功率范围覆盖面大; Ⅴ.摩擦、磨损小。A
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Ⅰ+Ⅱ+Ⅳ+ⅤD
Ⅰ+Ⅱ+Ⅲ+Ⅴ
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保持270°航向航行将直达B船B
向西保持在45°S纬度圈上航行将直达B船C
起始航向270°,以后其航向应逐渐适当增大可到达B船D
起始航向270°,以后其航向应逐渐适当减小可到达B船
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单选题The only cylindrical chart projection widely used for navigation is the().A
Lambert conformalB
MercatorC
aximuthalD
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单选题在下列装置中,属于内燃机的是()。 Ⅰ.燃气轮机 Ⅱ.蒸汽轮机 Ⅲ.煤气机 Ⅳ.汽油机 Ⅴ.柴油机 Ⅵ.蒸汽机A
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Ⅱ+Ⅳ+Ⅴ+ⅥD
Ⅰ+Ⅲ+Ⅴ+Ⅵ
考题
单选题Which of the following statements is true concerning all three-phase alternators?()A
Each has three separate but identical armature windings acted on by one system of rotating magnetsB
Each has one armature winding acted on by three identical but separate systems of rotating magnetsC
All three-phase alternators are designed to operate with a O8 leading power factorD
The three phases always provide power to the load through three sets of slip rings and brushes
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单选题电动型主机遥控系统转速限制回路中,当车钟搬至停车或应急停车时其输出为()。A
0B
最低稳定转速C
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