Which three of the following descriptions are true about the firewall modes？ （） [" Transparent mode is layer 2."," Routed mode is layer 3."," Routed mode has 1 IP address."," Transparent mode has 1 IP address."]
新系统流程图设计时需要注意哪些问题？
自然美的形式性指自然的美只在于自然事物的形式本身。
说文解字
计算残数
弹簧振子的振幅是4cm，完成一次全振动，小球通过的路程是多少？如果频率是5Hz，小球每秒通过的路程是多少？
