共回答了59个问题 举报
1年前
人站在自动扶梯上不动,随扶梯一起匀加速向上运动,则摩擦力方向?
1年前7个回答
你能帮帮他们吗
精彩回答
No one knows ______effects the GM material might have on the food chain
1年前
刘宁的航模飞机每分钟飞行352米,请你估算一下28分钟大约飞行多少米?
1年前
Could I have a rest, Sir.? —________, we have little time left.
1年前
After John had been in London for three years, he and his wife had a lot to tell ________.
1年前
计算: (1)1+2+3+4+5+6+7+8+9+10+11+12; (2)11+12+13+14+15+16+17+18+19.
1年前