Loran-C is which type of navigation system ________．
A. Hyperbolic，long-range navigation system
B. Short-range electronic
C. Long-range，high frequency navigation system
D. Long-range，with a frequency of 1950 kHz
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The most effective way of applying carbon dioxide from a portable extinguisher to a fire is by ______．
A. Forming a cloud cover over the flames
B. Directing the gas at the base of the flames in a slow sweeping motion
C. Discharging the carbon dioxide into the heart of the flames
D. Bouncing the discharge off an adjacent bulkhead just above the burning surface
What is the most appropriate action for a GMDSS radio operator to take in a distress situation where immediate help is needed，but the vessel is not sinking nor needs to be abandoned ________．
A. Switch off EPIRB and SART manually
B. Transmit distress call by MF/HF，VHF or INMARSAT
C. Notify the RCC（Rescue Coordination Center）through VHF FM on channel 13
D. Transmit distress call by activating the radiotelegraph automatic alarm signal
下列哪些情况下，可免受分道通航制条款的约束？
A. 紧急情况下为避免紧迫危险的船舶
B. 从事疏浚作业的船舶在作业所必须的限度内
C. AB均是
D. AB均不是
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