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【单选题】
关于IGMPSnooping的叙述，哪个是正确的？（）A.
IGMPSnooping会增加设备额外负担
B.
IGMPSnooping是IGMP的特殊版本
C.
IGMPSnooping是组播应用以太接入网中必须部署的技术
D.
IGMPSnooping运行在路由器接入用户的端口链路层上
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【简答题】When opening small businesses ,the most important thing for small-business owners to do is [A] to make a thorough ysis on the market. [B] to invest much more money in small business. [C] to cut do...
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【简答题】A．When you have small children. B．When you live in an apartment. C．When space is limited. D．When you live in the city.
【单选题】When opening small businesses, the most important thing for small-business owners to do is
A.
to make a thorough analysis on the market,
B.
to invest much more money in small business.
C.
to cut down the workers' wages,
D.
to think carefully about the internal specific conditions in the small enterprises,
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A.
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B.
叶剑形，排列如扇形，淡绿色，薄纸质。
C.
花垂瓣具蓝紫色条纹，瓣基具褐色纹，中央有鸡冠状突起，白色带紫纹，旗瓣较小，弓形直立，基部收缢，色较浅。
D.
性强健，耐寒耐旱，喜光，耐半阴，耐湿，喜酸性土壤。
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