We like playing with .[ ]
A. her
B. she
C. hers
D. us
答案:A
下列物质中属于复合肥的是( )
A.硝酸钾(KNO3)
B.硫酸钾(K2SO4)
C.氨水(NH3•H2O)
D.磷酸钙[Ca3(PO4)2]
司磅员的定期工作有哪些?