I类红砂岩特性是什么？
参考答案：
岩块天然单轴饱水抗压强度小于15Mpa，在105℃温度下烘干后浸水24小时内呈现渣状、泥状或粒状崩解。
Directions:
Study the following picture carefully and write an essay entitled "Noise Pollution. "
In the essay you should
(1) show your understanding about the issue,
(2) state your opinions and use facts to support your statement.
ARP Proxy主要是通过代理的方式来解决网络互通的问题，ARP Proxy以分为下面几种？（）
A.路由式ARP Proxy
B.VLAN 内ARP Proxy
C.二层ARP Proxy
D.VLAN 间ARP Proxy
