题目内容

只有在隔板中心经过调整或是挂耳松动重新固定后才需要对隔板挂耳的间隙进行测量和调整，隔板或隔板套结合不严密与挂耳间隙无关。

A. 正确
B. 错误

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Nexus# sh ip igmp snooping vlan 120 IGMP Snooping information for vlan 120 IGMP snooping disabled Optimised Multicast Flood （OMF） disabled IGMP querier none Switch-querier enabled， address 1.1.1.1， currently not running IGMPv3 Explicit tracking enabled IGMPv2 Fast leave disabled IGMPv1/v2 Report suppression enabled IGMPv3 Report suppression disabled Link Local Groups suppression enabled Router port detection using PIM Hellos， IGMP Queries Number of router-ports： 0 Number of groups： 0 Active ports： Po100 Po111 Which statement best describes what is depicted in the show command output？（）

A. IGMP snooping is not active for VLAN 120 because the IGMP feature has not been enabled on the switch with the feature igmp command.
B. The IGMP snooping querier for VLAN 120 is not in a running state because the Loopback interface configured with 1.1.1.1/32 is currently in a down state.
C. IGMP snooping has been disabled on the VLAN 120 SV
D. IGMP snooping has been disabled for VLAN 120 in VLAN configuration mode.
E. IGMP snooping is not active for VLAN 120 because VLAN 120 does not exist in the VLAN database.

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只有在隔板中心经过调整或是挂耳松动重新固定后才需要对隔板挂耳的间隙进行测量和调整，隔板或隔板套结合不严密与挂耳间隙无关。

A. 正确 B. 错误

饭店对从业人员的要求时什么？

活性染料锦纶针织物的染色工艺有哪几种？

速率理论认为色谱峰扩张与哪些因素有关？

A. 正确
B. 错误