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【单选题】
How are STP timers and state transitions affected when a topology change occurs in an STP environment？（）A.
All ports will temporarily transition to the learning state for a period equal to the max age timer plus the forward delay interval.
B.
All ports will transition temporarily to the learning state for a period equal to the forward delay interval.
C.
The default aging time for MAC address entries will be reduced for a period of the max age timer plus the forward delay interval.
D.
The default hello time for configuration BDPUs will be reduced for the period of the max age timer.
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【单选题】螺纹标记“M12-5g6g”中的“5g6g”表示 ( )
A.
内螺纹中径和顶径公 差带代号
B.
外螺纹小径公差带代号
C.
外螺纹中径和顶径公差带代号
D.
外螺纹顶径和中径公差带代号
【简答题】A. cl i mate B. res i st C. ol i ve D. i mportance
【简答题】鼠笼式异步电动机直接起动时, I st / I N =6 , M st /M N =1.8 ,现在采用星形 - 三角形 换接起动,则 I st / I N = ( ), M st /M N = ( ) 。