If separating effect is not good, which measure should be taken （）

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（） is not installed on the main switchboar.

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To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

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“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

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Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

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