为了防止吸附剂性能受到损害，要求吸附分离原料中的C9A含量≤500ppmwt。（）
参考答案：对
微型机运算器的主要功能是进行______。
A．算术运算
B．逻辑运算
C．加法运算
D．算术和逻辑运算
My father admitted that when _____ comes to pop music, he had little knowledge of it. [ ]
A. he
B. that
C. this
D. it
