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Which three statements about RSTP are true?()
A. RSTP significantly reduces topology reconverging time after a link failure.
B. RSTP expends the STP port roles by adding the alternate and backup roles.
C. RSTP port atates are blocking,discarding,learing,or forwarding.
D. RSTP also uses the STP proprsal-agreement sequence.
E. RSTP use the same timer-baseed process as STP on point-to-point links.
F. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
在省公司统一安排之外,管理分公司可根据本地话务变化情况,使用()
A. 超级基站
B. 应急通信车
C. 应急直放站
D. 卫星电话
充氮气运输的变压器应有压力监视和补充装置,在运输过程中应保持()的正压。
A. 0.01~0.03MPa
B. 0.03~0.06MPa
C. 0.06~0.09MPa
D. 0.09~0.12MPa
影响磨粉生产因素有,球磨机的()、()、衬板形状、球磨机直径、操作情况。