题型:问答题 简答题 一物体m放在粗糙的斜面上保持静止,先用水平力F推m,如图,当F由零逐渐增加但物体m仍保持静止状态的情况下,则…………………………………………( )①物体m所受的静摩擦力逐渐减小到零 ②物体m所受的弹力逐渐增加③物体m所受的合力逐渐增加 ④物体m所受的合力不变A.①③B.③④C.①④D.②④ 查看答案
题型:问答题 简答题 _______ wonderful news report he wrote! All of us were proud of him.[ ]A. What aB. What C. How D. How a 查看答案