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
