3 short blasts of the ship's whistle
1 short blast of the ship's whistle
3 long blasts of the ship's whistle
1 long blast of the ship's whistle
第1题:
A heated bulkhead has the effect on a hygroscopic commodity of ______.
A.causing moisture to accumulate against the bulkhead
B.lowering the vapor pressure of the commodity
C.lowering the dew point of the air
D.raising the vapor pressure of the commodity
第2题:
识别信号、询问信号和回答信号英文词汇分别为()。
第3题:
____,the bus started at once.
A、The signal was given
B、The signal giving
C、The signal given
D、When the signal given
第4题:
Green star rocket
Red star rocket
Orange smoke signal
Horizontal motion of a flag
第5题:
Paris
Florence
Rome
Milan
第6题:
第7题:
unbalanced rudders
balanced rudders
contraguide rudders
straight rudders
第8题:
A、Giving the signal
B、The signal being given
C、The signal given
D、The signal giving
第9题:
International Code Signal AA
orange-colored smoke
red flares
the repeated raising and lowering of outstretched arms
第10题:
abandon ship
dismissal from drills
fire and emergency
lower lifeboats