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What are main duties for Second Engineer？

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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

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What should be prepared before disassembly of cylinder for main engine or auxiliary engine？

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What are main duties for Third Engineer？

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Could you tell the working parts of a gas welding gun？

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