单项选择题
A.course B.track C.direction D.trend
The use of the danger signal（）.A.replaces directional s...
单项选择题The use of the danger signal（）.
A.replaces directional signals B.makes the other vessel the stand-on vessel C.indicates doubt as to another vessels actions D.is the same as a MAYDAY signal
The two main types of load cells used in mooring tensio...
单项选择题The two main types of load cells used in mooring tension gauges are（）.
A.distortion and compression B.hydraulic and mechanical C.magnetic and applied torque D.frictionless and hydraulic
The transmission of messages respecting the dangers spe...
单项选择题The transmission of messages respecting the dangers specified is free（）cost to the ships concerned.
A.of B.on C.at D.in
