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【单选题】
下列关于色甘酸钠预防哮喘发作机制的叙述，正确的是A.
稳定肥大细胞膜，抑制过敏介质释放
B.
阻止抗原与抗体结合
C.
有较强的抗炎作用
D.
有较强的抗过敏作用
E.
直接松弛支气管平滑肌应试点拨：本题主要考查色甘酸钠的药理作用。色甘酸钠主要是通过稳定肥大细胞膜，防止膜裂解和脱颗粒，从而抑制过敏介质的释放，防止哮喘的发作
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举一反三
【单选题】可燃气体泄漏报警和控制电路如下图所示,下列有关功能和注意事项的说明不正确的是:
A.
本电路中考虑设置预热环节,主要是接触燃烧式传感器的工作原理决定的。
B.
电路中D1的作用是单向导通,而D2和D3的作用是相同的
C.
若被测气体浓度高于报警点,则U2B的同相端电位高于反相端,U2B输出高电压,Q1导通,声光报警。
D.
若被测气体浓度低于报警点,则U2B反相端电位高于同相端,U2B输出低电压,Q1截止,报警电路不工作。
【单选题】下列Cisco第三层交换机的路由表信息中,路由表项全部正确的是
A.
O 202.205.159.0/24 [110/20] via 202.112.62.242, 00:23:00, Vlan2C 202.112.7.0/24 is directly commected, Vlan157C 219.243.224.168 is directy connected VIan30O E2 202.205.233.0/24 [110/20] via 202.112.62 242, 00:23:00,Vlan253S 202.38.97.196 [1/0]via 202.112.41.226S* 0.0.0.0/0 [1/0]via 202.112.38.17
B.
O 202.205.159.0/24[110/20] via 202. 112.62.242, 00:23:00 Vlan2
【单选题】如上图所示,如果a、b视为一个节点,那么在利用支路电流法时,下面描述正确的是
A.
可以列3个KCL电流方程和3个KVL电压方程
B.
可以列3个KCL电流方程和2个KVL电压方程
C.
可以列2个KCL电流方程和3个KVL电压方程
D.
可以列2个KCL电流方程和4个KVL电压方程
【单选题】下列Cisco第三层交换机的路由表信息中，路由表项全部正确的是______。
A.
O 202.205.159.0/24 [110/20] via 202.112.62.242,00:23:00,Vlan2C 202.112.7.0/24 is directly connected,FastEthernet2/2C 219.243.224.168 is directly connected,GigabitEthernet8/0O E2 202.205.233.0/24 [110/20] via 202.112.62.242,00:23:00,Vlan253S 202.38.97.196 [1/0] via 202.112.41.226S * 0.0.0.0/0 [1/0] via 202.112.38.17
B.
O 202.205.159.0/24 [110/20] via 202.112.62.242,00:23L00,Vlan2C 202.112.7.0/24 is directly connected,Vlan157C 219.243.224.168 is directly connected,Vlan30O E2 202.205.233.0/24 [110/20] via 202.112.62.242,00:23:00,Vlan253S 202.38.97.196 [0/0] via 202.112.41.226S * 0.0.0.0/32 [0/0] via 202.112.38.17
C.
O 202.205.159.0/24 [110/20] via 202.112.62.242,00:23:00,Vlan2C 202.112.7.0/24 is directly connected,Vlanl57C 219.243.224.168 is directly connected,Vlan30O E2 202.205.233.0/24 [110/20] via 202.112.62.242,00:23:00,Vlan253S 202.38.97.196 [1/0] via 202.112.41.226S * 0.0.0.0/0 [1/0] via 202.112.38.17
D.
O 202.205.159.0/24 [115/20] via 202.112.62.242,00:23:00,Vlan2C 202.112.7.0/24 is directly connected,Vlanl57C 219.243.224.168 is directly connected,Vlan30O E2 202.205.233.0/24 [115/20] via 202.112.62.242,00:23:00,Vlan253S 202.38.97.196 [1/0] via 202.112.41.226S * 0.0.0.0/0 [1/0] via 202.112.38.17
【单选题】下列是一台第三层交换机的路由表信息,表中的管理距离值为缺省值,其中路由表项全部正确的是
A.
O 162.105.152.0/24 [110/2]via 162.105.254.8, 00:23:00 Vlan2 O 162.105.152.0/24 [110/2]via 162.105.254.14, 00:23:00 Vlan2 C 162.105.157.0/24 is directly connected Vian157 C 162.105.156.0/24 is directy connected Vlan30 O E1 162.105.144.0/25 [110/30] via 162. 105.253.249,00:23:00,Vlan253 O 162.105.151.0/24 [110/2] via 162.105. 254.14,00:23:00 Vlan2 S 162.105.239.0/25 [1/0] via Vlan252 S 162.105.125.128/26 [1/0]via Vlan3
B.
O 162.105.153 0/24 [110/2]via 162. 105.254.8, 00:23:00 Vlan2 O 162.105.152.0/24 [110/2] via 162.105.254.14, 00:23:00, Vlan2 C 162.105. 157.0/24 is directly connected, 00:23:00 POS3/0 C 162.105.156.0/24 is directly conncted, 00:23:00, FastEthernet2/5 O E1 162.105.144.0/25 [110/30] via 162.105.253.249,00:23:00Vlan253 O 162.105.151.0/24 [110/2]via 162. 105.254.14.00:23:00. Vlan2 S 162.105.239.0/25 [1/0]via 202.112.41.6 S 162.105.125.128/26 [1/0] via 202.112.7.1
C.
O 162.105.153.0/24 [110/2] via 162. 105.254.8,00:23:00 Vlan2 O 162.105.152.0/24 [110/2] via 162.105.254.14 00:23:00 Vlan2 C 162.105.157.0/24 is directly connected Vian157 C 162.105.156.0/24 is directy connected Vlan30 O E1 162.105.144.0/25 [110/30] via 162. 105.253.249, 00:23:00,Vlan253 O 162.105.151.0/24[110/2] via 162.105. 254.14,00:23:00 Vlan2 S 162.105.239.0/25 [10]via 202112.41.6 S 162.105.125.128/26 [1/0] via 202.112.7.1
D.
O 162.105.153.0/24 [170/2] via 162. 105.254.8,00:23:00 Vlan2 O 162.105.152.0/24 [170/2] via 162.105.254.14 00:23:00 Vlan2 C 162.105.157.0/24 is directly connected Vian157 C 162.105.156.0/24 is directy connected Vlan30 O E1 162.105.144.0/25 [170/30] via 162. 105.253.249, 00:23:00,Vlan253 O 162.105.151.0/24[170/2] via 162.105. 254.14,00:23:00 Vlan2 S 162.105.239.0/25 [1/0]via 202112.41.6 S 162.105.125.128/26 [1/0] via 202.112.7.1
【单选题】下列是一台第三层交换机的部分路由表, 表中的路由信息完全正确的是
A.
O 162.105.153.0/24 [100/2] via 162.105. 254.8, 00:23:00 Vlan2O E1 162.105.144.0/25 [100/30]via 162. 105.253.249,00:23:10,Vlan253C 162.105.157.0/24 is drectly conmected VIan157C 162.105.156.0/24isis directy connected, Vlan30S 162.105.239 0/25 [1/0]via202.112.41.6S 162.105.125.128/26 [1/0] via 202.112.7.1
B.
O 162.105.153.0/24 [110/2] via 162.105. 254.8,00:23:00 Vlan2O E1 162.105.144.0/25 [110/30]via 162 105.253.249 00:23:00Vlan253
【单选题】关于交换机和路由表的说法错误的是________。
A.
广域网中的交换机称为分组交换机或包交换机
B.
每个交换机有一张路由表
C.
路由表中的路由数据是固定不变的
D.
交换机的端口有两种,连接计算机的端口速度较低,连接其它交换机的端口速度较高
【单选题】下列是一台第三层交换机的部分路由表，其中管理距离为缺省值，正确的路由信息是______。
A.
O 162.105.153.0/24[110/2]via 162.105.254.8，00:23:00，Vlan2 O \r\nE1162.105.144.0/25[110/30]via 162.105.253.249，00:23:00，Vlan253 \r\nC162.105.157.0/24 is directly connected.via 162.105.157.1 \r\nC162.105.156.0/24 is directly connected，via 162.105.156.1 \r\nS162.105.239.0/25[1/0]via 202.112.41.6 S162.105.125.128/26[1/0]via \r\n202.112.7.1
B.
O 162.105.153.0/24[120/2]via 162.105.254.8，00:23:00，Vlan2 O \r\nE1162.105.144.0/25[120/30]via 162.105.253.249，00:23:00，Vlan253 \r\nC162.105.157.0/24 is directly connected，Vlanl57 C162.105.156.0/24 \r\nis directly connected，Vlan30 S162.105.239.0/25[1/0] via \r\n202.112.41.6 S162.105.125.128/26[1/0] via 202.112.7.1
C.
162.105.153.0/24[110/2]via 162.105.254.8，00:23:00，Vlan2 O E1 \r\n162.105.144.0/25[110/30]via 162.105.253.249，00:23:00，Vlan253 \r\nC162.105.157.0/24 is directly connected，Vlan157 C162.105.156.0/24 \r\nis directly connected，Vlan30 S162.105.239.0/25[1/0]via \r\n202.112.41.6 S 162.105.125.128/26[1/0]via 202.112.7.0
D.
O 162.105.153.0/24[110/2]via 162.105.254.8，00:23:00，Vlan2 O \r\nE1162.105.144.0/25[110/30]via 162.105.253.249，00:23:00，Vlan253 \r\nC162.105.157.0/24 is directly connected，Vlanl57 C162.105.156.0/24 \r\nis directly connected，Vlan30 S162.105.2390/25[1/0]via \r\n202.112.41.6 S 162.105.125.128/26[1/0]via 202.112.7.1
【简答题】在电气系统中,元器件的驱动部分和被驱动部分表示方法有 3 种 : ( )、( )和( )。
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