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单选题
通常液压装置齿轮箱油比液压油使用寿命()。
A
更长
B
更短
C
差不多
D
不一定
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大潮日最大流速;其他日平均流速;3/4小潮日流速B
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at seaB
the ship was at seaC
she was at seaD
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