A.沉積巖B.巖漿巖C.火成巖D.變質(zhì)巖
A.堅(jiān)硬巖石B.半堅(jiān)硬巖石C.軟弱巖石D.極軟弱巖石
A.極堅(jiān)硬巖石B.半堅(jiān)硬巖石C.軟弱巖石D.極軟弱巖石