物态变化在日常生活中处处可见,下列物态变化属于升华的是( )
设a<b<0,a2+b2=4ab,则 a+ba−b 的值为____.
找出下列句子正确的答语。
A. No, there aren't.
B. Yes, it is.
C. Yes, I like it very much.
D. No, I can't.
E. Yes, there is.