单项选择题
rat guard()
A.灭鼠剂
B.挡鼠板
C.鼠疫
D.守卫
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单项选择题
bulwark()
A.舷墙
B.舷梯
C.天窗
D.桅杆
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单项选择题
oil can()
A.油壶
B.油浓度表
C.油罐
D.油泵
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