A:X是稀盐酸
B:Y是水
C:Z是石灰水
D:无法确定X、Y、Z
提出元素周期律并根据周期律编制第一个元素周期表的科学家是( )
不等式.x2>x.的解集是( )
下列山脉与地形区相邻的一组是( )
— Tom just told me a new way he had thought of new words.
— It's great. What do you think of it?