题目

如图所示，物体A和B叠放在固定光滑斜面上，A、B的接触面与斜面平行，当A、B以相同的速度沿斜面向上运动肘，关于物体A的受力个数，正确的是 A．2    B．3 C．4    D．5 答案：B — Tony, may I have a talk with you now?— Sure. Oh, it’s noisy here. Let’s go ______.A. quiet somewhere B. somewhere quietC. quiet anywhere D. anywhere quiet