题目内容

Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each

A. the power stroke
B. the compression stroke
C. low load operation only
D. periods of standby

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当接通气象雷达“STB”功能时，可控制天线从零基准位置向上，向下各___之间的俯仰运动：

A. 15°
B. 20°
C. 30°
D. 45°

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A. 0.1s
B. 1-3s
C. 5s
D. 30s