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问题 单项选择题

常用的16Mn钢是牌号为______的低合金高强度钢。

A．Q235

B．Q295

C．Q3415

D．Q390

答案

参考答案：C

单项选择题

植物生长发育必需的矿质元素有：（）

A．9种

B．13种

C．16种
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单项选择题

只封禁一台IP地址为203.168.47.59主机的access-list的正确配置是______。

A．access-list 110 permit ip any any
access-list 110 deny ip host 203.168.47.59 any
access-list 110 denyip any host 203.168.47.59
B．access-list 110 deny ip host 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59
access-list 110 permit ip any any
C．access-list 110 denyiphost 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59
D．access-list 110 deny ip host 203.168.47.59 any
access-list 110 permit ip any any
access-list 110 deny ip any host 203.168.47.59
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