航海英語液體散貨運(yùn)及有關(guān)規(guī)則單項(xiàng)選擇題每日一練(2019.01.21)

來源：考試資料網(wǎng)

1 A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.

2 In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.

3 Individual wires，used in systems greater than 50 volts,（）.

4 A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must（）.

5 A tank which is NOT completely full or empty is called（）.

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