单项选择题
A.on B.by C.in D.for
A.stop down B.speed down C.slow down D.down slow
A.SOS，ZZZ，XXX B.SOS，UUU，SSS C.SOS，XXX，TTT D.SOS，TTT，UUU
A.final topping off is occurring B.first starting to receive fuel C.hoses are being blown down D.hoses are disconnected and being capped
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