A.Non-toxic gas
B.oxygen
C.Hydrogen
D.Helium
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A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap
A.turned off
B.already
C.almost
D.ready
A.M is not fixed at large angle
B.there is no M at large angles
C.G is not fixed at large angles
D.there is no G at large angles
A.good towing ground
B.good holding ground
C.good grabbing ground
D.good dragging ground
A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fule with a nonflammable surface
最新試題
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Bales close to the deckhead should be covered to prevent().