A:孟加拉湾
B:阿拉伯海
C:波斯湾
D:地中海
如图,在矩形ABCD中,E为BC上一点,AE⊥DE,∠DAE=30°,若DE=m+n,且m、n满足m=n-8+16-2n+2,试求BE的长.
—Which of the two subjects do you like, PE or music?—— . They are really interesting.