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【单选题】
干船坞的主体部分是以下哪一部分？（）
A.
坞室
B.
坞口
C.
灌排水系统
D.
拖曳系缆设备
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【单选题】To swim across the English Channel takes at least nine hours. It’s a hard work and it makes you short of breath. To fly over the Channel takes only twenty minutes, but it’s an expensive way to travel....
A.
not more expensive to be built than a bridge
B.
not more expensive to be built than a rail
C.
. cheaper to be built than a rail
D.
not cheaper to be built than a bridge
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【单选题】To swim across the English Channel takes at least nine hours. It’s a hard work and it makes you short of breath. To fly over the Channel takes only twenty minutes, but it’s an expensive way to travel....
A.
not more expensive to be built than a bridge
B.
not more expensive to be built than a rail
C.
. cheaper to be built than a rail
D.
not cheaper to be built than a bridge
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