A:(-2a3)2=4a5
B:(a-b)2=a2-b2
C:6a+13=2a+1
D:2a3•3a2=6a5
读北半球某地面水平气压分布图,回答问题。
It's impossible ____ (learn) English well in a short time.
Do you want to make ______ her?
36.32°=____°____ ′____″.
1230 ____ 1536