问答题
为了使路由器知道多播组成员的信息，需要使用（）协议。
为了使路由器知道多播组成员的信息，需要使用（）协议。
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单项选择题
If you tend to regularly suffer from a certain symptom like headache, be sure to keep in store the _______ medicine to take care of the issue as soon as it starts.
If you tend to regularly suffer from a certain symptom like headache, be sure to keep in store the _______ medicine to take care of the issue as soon as it starts.
A．efficient
B．concise
C．appropriate
D．secure