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单选题
过测者天底和两天极的半个大圆称为（）。
A
测者真地平圈
B
天体时圈
C
测者子圈
D
测者午圈
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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
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Ⅱ＋Ⅲ＋Ⅳ＋ⅥD
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单选题The undersigned （）that he is duly authorized by the said Government to issue this certificate.A
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电位计或－10～＋10VDC电压C
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4～20mA电流或0～10VDC电压
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of the diaphragm typeB
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应记录在适任证书的等级与职务适用限制一栏中B
应记录在船员服务簿主管机关签注（一）一栏中C
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not required to be anywhere on the vesselB
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required to be painted on the vessel;s sternD
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have the physical capability to fulfill all the requirements of the basic trainingB
demonstrate adequate hearing and speech to communicate effectivelyC
are suffering from any medical conditions likely to be aggravated by service at seaD
have no medical condition that will prevent the effective e and safe conduct of their routine and emergency duties on board
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analoggerB
bell loggerC
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data logger
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prolonged maintenance intervalsB
improved atomizationC
greater fuel economyD
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RemainB
to remainC
retainD
to retain
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forced circulating pumpB
compressed airC
gravity tankD
bead tank
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金属B
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