A.a blast of from five to seven seconds' duration
B.a blast of from five to six seconds' duration
C.a blast of from four to six seconds' duration
D.a blast of from six to seven seconds' duration
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A.at
B.for
C.in
D.on
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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