在PPP协议中,CODE字段等于9的LCP报文代表什么含义
A.Echo-Request
B.Echo-Reply
C.Terminate-Request
D.Terminate-Ack
A.实际总壁厚0.30mm
B.底壁厚0.30mm
C.齿高0.30mm
D.名义总壁厚0.30mm
A.芯头实际外径8.48mm
B.芯头名义外径8.48mm
C.管坯内径8.48mm
D.铜管外径8.48mm
A.芯头齿顶角29°
B.芯头螺旋角29°
C.生产铜管齿顶角29°
D.生产铜管螺旋角29°