A.20~30mPa·s B.20~40mPa·s C.10~15mPa·s D.15~30mPa·s
A.膨潤土 B.有機(jī)土 C.抗鹽土 D.劣質(zhì)土
A.10mPa·s B.15mPa·s C.20mPa·s D.25mPa·s