【简答题】若MCS-51单片机采用12MHz的晶振,它的机器周期(),ALE引脚输出正脉冲频率为()。
【单选题】下列协议中,不属于内部网关协议的是( )。
【简答题】非侵染性病害的特点是什么_诊断方法是什么_
【单选题】I ’ m examining the composition he has just finished ______ the possible mistakes in it.
【单选题】I'm examining the composition he was finished___the possible mistakes in it.