单项选择题

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）

A.With gooseneck vents
B.With warning signs
C.With flame screens
D.With pressure-vacuum relief valves

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单项选择题

How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）

A.De-energizes the "charged mist" effect
B.Maintains a positive pressure on the vent header to cool the flammable vapors
C.Inert gas filters out the flammable vapors from the cargo tank spaces
D.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit

单项选择题

How about deducting 10 bundles，（）is to say 50 bundles partly rusty?

A.it
B.this
C.that
D.which

单项选择题

Fearing damage from either or both of the above incidents，the Master now（）me this note of protest，reserving to himself the right to extend same at time and place convenient．

A.enters
B.enters into
C.enters with
D.enters to