()isthenavigationaltimekeeperofthevessel.
A. Themarinesextant
B. Thechronometer
C. Themagneticcompass
D. Thegyrocompass
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根据《龙门架及井架物料提升机安全技术规范》(JGJ88-2010),物料提升机额定起重量不宜超过()kN,安装高度不宜超过()m。
A. 150;25
B. 150;30
C. 160;30
D. 160;35
()isusedforreceivingmaritimesafetyinformationwhichisautomaticallyprintedbythereceiver.
A. NAVETEXreceiver
B. SearchandRescueTransponder
C. EmergencyPositionIndicatingRadioBeacon
Digitalselectivecalling
曲柄连杆机构属于以下哪一部分的机构()
A. 车身
B. 电气设备
C. 发动机
()isanindicationthattheweatherisabouttoclear.
A. Risingclouds
B. Loweringclouds
C. Thickeningclouds
D. Scatteringclouds