探放水钻孔结束,必须核实()
A.钻孔方位
B.钻孔实际深度
C.孔斜角度
D.钻孔个数
参考答案:A, B, C
In many countries more and more forests and even agricultural land are being lost to development, _______ much of the land to become desert.
A.caused
B.causing
C.having caused
D.to cause
下列物质中,能作磷肥的是
A.Ca(H2PO4)2
B.NH4HCO3
C.K2CO3
D.CO(NH2)2