打开空气呼吸器钢瓶阀门,最少转()圈。
参考答案:2
When a bridge transmits an Ethernet frame, the Ethernet frame has ().
A.the broadcast address for the its source address
B.the bridge’s LAN address for its destination address
C.the bridge’s LAN address for its source address
D.none of the above
强迫性行为不包括()
A、强迫性表象
B、强迫性检查
C、强迫性计数
D、强迫性洗涤
E、以上都不是