在學(xué)習(xí)運(yùn)動(dòng)的合成與分解時(shí)我們做過如圖所示的實(shí)驗(yàn).在長約80cm~100cm一端封閉的玻璃管中注滿清水,水中放一個(gè)用紅蠟做成的小圓柱體(小圓柱體恰能在管中勻速上。,將玻璃管的開口端用膠塞塞緊,然后將玻璃管豎直倒置,在紅蠟塊勻速上浮的同時(shí)使玻璃管緊貼黑板面在水平方向上勻加速移動(dòng),你正對黑板面將看到紅蠟塊相對于黑板面的移動(dòng)軌跡可能是下列選項(xiàng)中的(                                                                             )                     

                                                                                                             

   A.                  B.                         C.      D.

                                                                                                                                 

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