题目内容

现场急救时，对昏迷病人()给任何东西吃。

A. 随意
B. 可以
C. 不要

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毒蛇咬伤开创排毒的同时()控制静脉血液回流速度，防止中毒身亡。

A. 不要
B. 要
C. 止血

心脏病的急救药“硝酸甘油”应()才能有效。

A. 随意使用
B. 用水服下
C. 含在舌根底下

___ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
_ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
___ A．changing B．reasons C．popular D．found E．anywhere F．down G．finding H．level I．different J．away K．outdoor L．sleep
请帮忙给出每个问题的正确答案和分析，谢谢！

PIFS长度是SIFS外加一个时隙的长度()