环境的物理自净作用不包括()。
A.稀释
B.逸散
C.中和
D.凝聚
E.挥发
参考答案:C
With the support of the Chinese government, many patients in poor areas can _ to
go to hospital.
A.afford
B.attend
C.accept
D.agree
磨机内的球料比是指。()
A.磨内的研磨体的量
B.磨内物料的量
C.磨内研磨体的质量和物料质量之比