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what is the use of a purifier ?explain the purpose of a gravity disc ?
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A.DISC-REL-CLEARB.REL-DISC-CLEARC.CLEAR-REL-DISCD.CLEAR-DISC-REL
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下列描述Android中gravity与layout_gravity说法不正确的是()。
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During UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is full of oil. Should he ____.A.Stop all F.O. transfers immediately, and inform the chief engineer.B.Make a sounding of the F.O. overflow tank and decide if there is enough capacity to leave it until the following morning.C.Call a motorman and have him sound the F.O. overflow tank periodically during the night.D.start the F.O. purifier
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