A.5%~10% B.6%~12% C.7%~14% D.8%~15%
A.3% B.5% C.10% D.15%
A.地形起伏、剝離層與有用層厚度有變化的料場(chǎng) B.地形平緩、有用層厚度較穩(wěn)定的料場(chǎng) C.勘探網(wǎng)(點(diǎn))布置不規(guī)則的料場(chǎng) D.地形起伏、勘探網(wǎng)(點(diǎn))布置不規(guī)則的料場(chǎng)