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搜题
【多选题】
Which three statements about the DHCP snooping feature on Cisco Nexus switches are true？ （）A.
DHCP snooping commands are not available until the feature is enabled with the feature dhcp- snooping command.
B.
When you enable the DHCP snooping feature， the switch begins building and maintaining the DHCP snooping binding database.
C.
The switch will not validate DHCP messages received or use the DHCP snooping binding database to validate subsequent requests from untrusted hosts until DHCP snooping is enabled globally and for each specific VLAN.
D.
Globally disabling DHCP snooping removes all DHCP snooping configuration on the switch.
E.
Globally disabling DHCP snooping does not remove any DHCP snooping configuration or the configuration of other features that are dependent upon the DHCP snooping feature.
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【简答题】现代农业对作物品种性状的要求为____、____、优质、生育期适宜、适应机械化操作。
【单选题】对于汽车空调的控制，哪种说法不正确（）
A.
制冷系统中设有温控开关，能够任意地设定车厢内温度
B.
过热开关安装在紧靠压缩机入口处，是一个温度传感开关
C.
若系统缺少制冷剂，过热开关打开，切断接地电路
D.
当环境温度较高时，环境温度开关切断电池离合器的电流