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【单选题】
Battens are fitted in cargo holds across the frames of the vessel from the turn of the bilge upward. The purpose of these cargo battens is（）.A.
for securing a snatch block when snaking cargo into the wings of the hold
B.
to prevent cargo from coming in contact with the vessel's frames or shell plating
C.
tp prevent fittings to which cargo lashing may be secured
D.
to support the dunnage floors which are laid down between tiere of cargo
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【简答题】( )的发生,标志着日本全面侵华战争的爆发和中国全国性抗日战争的开始。 A、九一八事变 B、一二八事变 C、七七事变
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