采用波纹管补贴套管时，井架高度应能满足一次入井波纹管长度要求。
参考答案：对
根据种在群落中的作用划分的群落成员型通常有哪几种
—Did Jack come back early last night?
—Yes. It was not yet eight o' clock he arrived home
A．before
B．that
C．when
D．until
