下列各选项中所述的两个量,前者一定大于后者的是( )
A:1 L 0.3 mol/L CH3COOH溶液和3 L 0.1 mol/L CH3COOH溶液中的H+数
B:pH=1的CH3COOH溶液和盐酸的物质的量浓度
C:pH=12的氨水和NaOH溶液的导电能力
D:pH相同的等体积的盐酸和醋酸溶液分别与足量锌粒反应产生的气体体积
写反义词。
安全—____ 踌躇—____ 紧张—____ 冷淡—____
Hello,my name is Danny. I am a tall boy. I have a big face and two big eyes. I can read books and write English. I am a good student. I have a happy family. My father and mother are teachers. My father is 35 years old and my mother is 33 years old. My father is tall and thin. He can swim and dive. My mother isn't tall. But she's thin. She can draw nice pictures.