根据表中化学键的键能（KJ/mol）数据，下列分子受热时最稳定的是
A．氢气
B．氟化氢
C．氯化氢
D．溴化氢
答案：B
以下对于先天性虹膜缺损描述错误的有
A．主要由于胚裂不闭合或闭合不全所致B．常见虹膜上方或鼻上方呈完全或部分缺损C．瞳孔呈梨形，尖端向下D．常合并相应部位的脉络膜缺损E．多为双眼对称性改变
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 deny ip any host 203.168.47.59
B．access-1ist 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 deny ip host 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
