① ② ③ ④C2H4 ⑤C3H6⑥
A:①和②
B:④和⑤
C:①和③
D:④和⑥
三个同学根据不同的实验条件,进行了“探究平抛运动规律”的实验:
下列交通运输方式不属于现代交通运输方式的是( )
–Listen! Someone is playing ______ piano.
–Wow! What beautiful music! I like it very much