若tanα·tan32°=1,则锐角α=( )。
58°
—Can you tell me why you learn English so well?
—It's very simple. _____ you work, _____ grades you will get. [ ]
A. The harder;the best
B. The bard;the better
C. Harder;better
D. The harder;the better
下列指标中哪项可以用来描述计量资料的离散程度()
A.P75
B.G
C.M
D.R