题目内容
( )是指如何防止信息源用户对其自身发送的信息事后不承认，或者是用户接收到信息之后不认账。
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高速路由器一般要求长度为1518B的IP包，延时要小于( )。
I have never taken a plane. My friend Li Ping, either.______ us have ever taken a plane.
( )是指路由器的具体一个端口的包转发能力。
Indians always shake (摇) their heads when they talk to others. (41) does not have the same meaning (42) "no". If someone wants to visit India, (43) should know this, (44) it will give him some trouble. One day, a foreign officer went to India on business. He hired (雇佣) a car and an Indian to drive it. When he (45) the driver to send him to his office, the driver shook his (46) at once. The officer repeated his order, and the driver (47) so again. At last, the officer, of course, got (48) . " (49) dare you refuse (拒绝) my order" he shouted. "Drive me to office immediately!" The driver answered (50) quite a loud voice, too. "Yes, sir !" But he still shook his head at the same time. Suddenly the officer realized that, "No means Yes here!\
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