I often go to a movie my good friends.[ ]
A. on
B. and
C. with
D. in
答案:C
《中国药典》规定中药材的灰分测定系指()
A.干燥失重
B.生理灰分
C.酸不溶性灰分
D.炽灼残渣
对流换热系数(表面传热系数)h