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_________ (游泳) for some time after a tiring day is very enjoyable and exciting for me in summer.
1年前
1年前
It’s reported that the government hasn’t found the missing plane’s black box yet.
1年前
质量为m,电荷量为q的带电粒子,以初速度v沿垂直磁场方向射入磁感应强度为B的匀强磁场,在磁场中做匀速圆周运动
1年前
how many ____ have you got on your farm? I have got five.
1年前