鉴定性估价与咨询性估价有何不同？对估价作这两种区分有何意义？
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Which statement describes a spanning-tree network that has converged?（）
All switch and bridge ports are in the forwarding state.
B. All switch and bridge ports are assigned as either root or designated ports.
C. All switch and bridge ports are in either the forwarding or blocking state.
D. All switch and bridge ports are either blocking or looping.
弘扬主旋律，社会思想就有了主心骨；传播正能量，社会发展就有了动力源。
A. 正确
B. 错误
登山绳分为动力绳和静力绳，动力绳为白色，静力绳为花色。
A. 正确
B. 错误
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