‌‏在逆流吸收过程中，操作液气比增大，操作线与平衡线之间的距离（ ）。‏ A、减小 B、增大 C、不变 D、不……

单项选择题Filling blanks with the right indefinite or definite articles: Interactional competency is ______ ability to communicate with others. Piano is _____ type of musical instrument which consists with strings and keys. Culture is _____ set of features and variables that define a group of community.

单项选择题下列不属于哺乳母猪的泌乳特点的是( ) A. 母猪各乳腺间不相通连; B. 一般靠近前边胸部的几对乳头泌乳量比后边的低 C. 反射性排乳 D. 泌乳高峰为产仔后的15—30天