总劳动时间为2 000亿小时，劳动生产率为45美元／小时，实际GDP是多少？
查看答案
右表给出的是美国的相关数据。计算每年的劳动生产率。
What are main duties for Second Engineer？
For most diesel propulsion and generator engines, the over-speed trip device will stop the
A. moving the governor control to stop
B. shutting off the lubricating oil supply
C. tripping the governor emergency stop lever
D. shutting off the fuel supply
What should be prepared before disassembly of cylinder for main engine or auxiliary engine？
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