车削外圆柱面和车削套类工件时，它们的切削深度和进给量通常是相同的。（）
参考答案：错
She had golden hair when she was a child, but_________ she got older and older, her hair went darker and darker．
A．while
B．when
C．after
D．as
管套通信有什么特点？
