题目内容

绿地对城市生态环境的作用,下列叙述正确的是()

A. 调节城市大气碳氧平衡
B. 有明显的增温降湿效应
C. 减少城市地区日照时间
D. 消除城市大气酸雨污染

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两个或多个群落或生态系统之间的过渡区域叫()。

After updating serverB's network configurations, anadministrator notices that serverA, which resides in a different subnet, is unable to communicate with serverB via ssh or telnet. As ping's to the server fail, the administrator logs onto serverB via a console and finds an available interface en0 in the 'up' state. From the console connection, en0 can communicate with other servers in the same subnet. What is the most likely cause of the problem?()

A. en0 has no associated ip address.
B. serverB is missing its default route.
C. serverB and serverA cannot connect due to a firewall.
D. en0 has been set up to block traffic from servers that are in different subnets.

工程保险承保的风险基本上是()风险。

A. 小额
B. 差额
C. 巨额
D. 定额

比较电压门控通道和化学门控通道的异同点。

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