用数字式万用表测量直流电流时,量程开关拨至()范围内的合适挡。
A. “DVC”
B. “DCA”
C. “ACA”
D. “ACV”
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What is the minimum operation time of reserve source of energy on ships without an emergency energy source?
A. 1 hour
B. 6 hours
C. 12 hours
D. 24 hours
What is the minimum operation time of reserve source of energy on ships with an emergency
A. 1 hour
B. 6 hours
C. 12 hours
D. 24 hours
Which of the following documents are required by GMDSS for vessels on international voyages?
A copy of the IMO master plan of shore-based facilities
B. Station logs
C. ITU Radio Regulations
D. All of these
Which radio equipment is not necessary for the ships sailing in the sea area A1?
A. NAVTES receiver
B. VHF EPIRB
C. 406MHz EPIRB
D. VHF DSC