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You are on a cargo vessel carrying toluol in bulk in portable tanks. Which is a requirement for pumping the toluol? （）
A:Hose connections to the tank must be made with a minimum of three bolts
B:There must be water pressure on the fire main
C:You must shut down if another vessel comes alongside
D:If transferring at anchor，you must display a red flag by day and a red light at night

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出自：海船船员证

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