A:that; what
B:that; that
C:when; what
D:when; that
一定温度下,将溶液用水稀释,一定不变化的量是( )
— He's never advised to achieve a balance between his job and hobbies, ________? — _______. His parents and teachers often offer him advice.
下图表示北半球一种重要的地貌形态。读图,回答下列各题。