题目内容：
A. LearningB. Spanning
C. Listening
D. Forwarding
E. Initializing
F. Filtering
G. Permitting
参考答案：
选择题：Which of the following are spanning tree port states?()
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增施有机肥料,可以改变土壤质地。()
增施有机肥料,可以改变土壤质地。()
Which enhancement w as added to IGMP version 3?()
Which enhancement w as added to IGMP version 3?()
苗木培育过程中,要尽量少移植,否则对其生长不利。()
苗木培育过程中,要尽量少移植,否则对其生长不利。()
Refertotheexhibit.Basedupontheinformationthatisgiven,howwillvoicetrafficfromthephoneanddatatrafficfromthePCbehandledbySW_1?()
Refertotheexhibit.Basedupontheinformationthatisgiven,howwillvoicetrafficfromthephoneanddatatrafficfromthePCbehandledbySW_1?()
接穗和砧木之间形成共同的形成层,是嫁接成活的关键。()
接穗和砧木之间形成共同的形成层,是嫁接成活的关键。()