A:a2
B:a
C:a12
D:a13
用方框中所给单词的适当形式填空,每词仅用一次(每空一词)。
bad two win cheap write
—Why do you like winter?
—Because I can go ice-skating.
如图,AC是电线杆AB的一根拉线,测得BC的长为6米,∠ACB=50°,则拉线AC的长为( )