Which one of the following is the safety signal ().
A.SSS
B.TTT
C.XXX
D.FFF
第1题
A.Using a full tank to keep the pump primed
B.Opening the vent cock on the pump
C.Closing down on the tank valve
D.All of the above
第2题
A.Falling barometric pressure
B.Rising barometric pressure
C.The circulations of winds
D.The change of wind direction
第3题
A.Securite
B.Mayday
C.Breaker
D.Pan
第4题
A.use English language
B.always use the International Code
C.preface it by the word“Interco”
D.follow the transmission with the radio alarm signal
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