I a pet. I like it. [ ]
A. have
B. has
C. haves
A
下列化学方程式书写错误的是( )
A.4P+5O2 点燃 . 2P2O5
B.CH4+2O2=CO2+2H2O
C.Zn+CuSO4=ZnSO4+Cu
D.CaCO3+2HCl=CaCl2+CO2↑+H2O
导线在恢复绝缘时,绝缘带与导线保持约45°的倾斜角,每圈包缠压选带宽的一半。