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BLAST应用有哪些？
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A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound ______.A.a 2-second blast every 20 secondsB.a 4-second blast every 20 secondsC.an 8-second blast every 30 secondsD.a 10-second blast every 30 seconds
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单选题You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.A
one blast，4 to 6 seconds in durationB
three blasts，4 to 6 seconds in durationC
one continuous blast until you are able to see around the bendD
one blast，8 to 10 seconds in duration
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单选题In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.A
supply clean air to the measuring compartment of the units for more accuracyB
generaate the pressure required for the extraction of the oil mist from theC
generate the pressure required for the extraction of the oil mist from the crankcaseD
supply clean air to the measuring track of the units for more accuracy
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单选题You are Master of a towing vessel engaged in towing three barges astern.The middle barge of the tow would be required to sound which of the following during restricted visibility （）.A
No fog signalB
A prolonged blast at intervals never to exceed more than two minutesC
A prolonged blast followed by two short blasts at intervals never to exceed more than two minutesD
A prolonged blast followed by three short blasts at intervals never to exceed more than one minute
考题
单选题Traditionally，the signal for fire aboard ship is（）.A
more than 6 short blasts and 1 long blast on the whistle，and the same signal on the general alarmB
continuous sounding of the ship's whistle and the general alarm for at least 10 secondsC
1 short blast on the whistleD
alternating short and long blasts on the ship's whistle
考题
单选题Which of the following represents the emergency signal for fire aboard ship?（）A
More than six short blasts and one long blast on the whistleB
Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarmC
Three short blasts of the whistle supplemented by the same signal on the general alarmD
More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm
考题
单选题The abandon ship signal sounded by the vessels whistle is （）.A
6 short blasts and 1 long blastB
long blast mare than 6 short blastsC
more than 6 short blasts and 1 long blastD
1 long blast of at least 10 seconds
考题
单选题The term PROLONGED BLAST refers to（）.A
a blast of from five to seven seconds' durationB
a blast of from five to six seconds' durationC
a blast of from four to six seconds' durationD
a blast of from six to seven seconds' duration
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