题干
— It's raining heavily. You'd better _______ your raincoat.
— All right.
A：put off
B：put up
C：put on
D：put away
答案(点此获取答案解析）
C
— It's raining heavily. You'd better _______ your raincoat.
— All right.
A：put off
B：put up
C：put on
D：put away
角，t+t0时刻速度与水平方向成
角，不计空气阻力，重力加速度为g，则小球初速度大小为（ ）