土中各个土粒粒组的相对含量可通过现场剪切试验得到。
参考答案：错
---Could you please tell me ___________? ---Of course. For over ten months.
A．how long has he left school
B．how long he has left school
C．when he left school
D．how long he has been away from school
PP—R管道电熔连接分为（）。
A.电熔承插连接
B.电熔回形连接
C.电熔对接连接
D.电熔鞍形连接
