On ____ Friday when Tom was having an art lesson, as he had no color pencils with him, he

drew _____ blue sun with his pen. [ ]

A. 不填; the

B. 不填; a

C. the; the

D. a; a

在同一温度下，理想混合气体中某一种气体单独占有与混合气体相同的体积时对器壁所产生的压力，称为该种气体的分压。