The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is ()
A. the same, whether at sea, or during maneuvering
B. adjusted during each hour of operation while at constant RPM
C. higher at sea than while maneuvering
D. lower at sea than while maneuvering
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轴面倾斜,两翼岩层倾向相同,一翼岩层层序正常,另一翼岩层层序倒转的褶曲是()褶曲。
A. 平卧
B. 倒转
C. 斜歪
D. 直立
制作承重木结构的方材板材和原木,根据木材中所存在的缺陷的数量和大小,均分为()级。
缅甸矿产资源丰富,其中钨矿和铬矿产量都居世界第一位。
A. 正确
B. 错误