A:四种物质都存在
B:有甲酸乙酯和甲酸
C:有甲酸乙酯和甲醇
D:有甲酸乙酯,可能有甲醇
掌握仪器的名称、组装及使用方法是中学化学实验的基础,如图为两套实验装置.
——Which share is for me ?——Your can take _____ half. They are exactly the same.
甲以乙为参照物是静止的,甲以丙为参照物是运动的,则乙以丙为参照物应是( )
There is _______ food in the fridge. It's enough to eat.