单选题A tourniquet should be used to control bleeding ONLY（）.Awith puncture woundsBwhen all other means have failedCwhen the victim is unconsciousDto prevent bleeding from minor wounds
单选题
A tourniquet should be used to control bleeding ONLY（）.
A
with puncture wounds
B
when all other means have failed
C
when the victim is unconscious
D
to prevent bleeding from minor wounds
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