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微胶囊饲料在水中的稳定性主要靠（）来维持。

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由社会和自我所认可的目标更能带来幸福感。（）

A. 正确
B. 错误

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《咬文嚼字》运用“推敲”典故所说明的是（）。

A. 更改一两个字是要是文字顺畅些或是漂亮些
B. 在文字上推敲，骨子里实在是在思想情感上“推敲”
C. “敲”比“推”更与全诗调和些
D. 韩愈的修改确实恰当些

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药品经营企业只有销售地道中药材时，才必须标明产地。

A. 正确
B. 错误

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Which two statements are true about Internet Group Management Protocol (IGMP) snooping?（）

A. IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch.
B. IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own.
C. IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router.
D. IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches.
E. IGMP snooping is enabled with the ip multicast - routing global configuration command.

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