Main propulsion engine lube oil sumps should be constructed ()
A. so as to never be integral lube
B. with a sloped bottom
C. only of nonferrous, noncorrosive metals
D. with drain/return lines terminating just above or at the designed normal level
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产品从生产者流向最终消费者的过程,不经过任何中间商转手的分销渠道指的是()。
A. 零阶渠道
B. 一阶渠道
C. 二阶渠道
D. 三阶渠道
铺设提速道岔时,对于绝缘处所应先进行焊接铺设再由电务部门测试,确认是否合格。
A. 正确
B. 错误