单选题When whistle signals are used for launching lifeboats，one short blast means（）.Ause the float-free method onlyBlower all boatsCraise all boatsDdrill is over，secure all boats
单选题
When whistle signals are used for launching lifeboats，one short blast means（）.
A
use the float-free method only
B
lower all boats
C
raise all boats
D
drill is over，secure all boats
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