A. 3mg/L B. 6mg/L C. 4.5mg/L D. 2mg/L
A. 测量定位→钻孔→清孔→注胶→植筋→养护 B. 测量定位→钻孔→注胶→清孔→植筋→养护 C. 测量定位→钻孔→清孔→植筋→注胶→养护 D. 测量定位→钻孔→清孔→注胶→养护→植筋