问题
选择题
—I'm going to Sanya for my holiday tomorrow.
—_______ [ ]
A. Have a good time!
B. You're right.
C. It's good.
D. Goodbye!
答案
答案：A
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—I'm going to Sanya for my holiday tomorrow.
—_______ [ ]
A. Have a good time!
B. You're right.
C. It's good.
D. Goodbye!
答案：A
相连接的物块A 、B ．它们的质量分别为mA、mB，弹簧的劲度
系数为k , C为一固定挡板。系统处于静止状态。现开始用一恒力F沿斜面方向拉物块A 使之向上运动，求物块B 刚要离开C时物块A 的加速度a 和从开始到此时物块A 的位移d。重力加速度为g。