15m2=20dm2;
2300dm3=2.3m3.
故答案为:20,2.3.
— Are you satisfied with what she has done?
— Not at all. It couldn’t be _______.
A.so bad
B.any worse
C.much better
D.the best
航天飞机在飞行过程中完全不依靠航空原理。