【单选题】She worked hard at her task before she felt sure that the results would ______ her long effort.
【简答题】一个由4个构件组成的机构一共有______个瞬心,其中有______个绝对瞬心,有______个相对瞬心。
【单选题】一质量为m的质点,自半径为R的光滑半球形碗口由静止下滑,质点在碗内某处的速率为v,则质点对该处的压力数值为
【单选题】一个由5个构件组成的机构一共有______个瞬心,其中有______个绝对瞬心,有______个相对瞬心。
【简答题】The girl worked so hard that (ual) ______ she made herself seriously ill.
【简答题】A.She worked hard and was successful. B.She lived a poor life in the past. C.She needs much sleep. D.Both A and B
【判断题】通常皮肤表面的pH值为4.5~6.5,呈弱酸性。()
【单选题】Susan worked very hard and she picked _____ oranges of all the children on the farm.
【单选题】一个由 4 个构件组成的 机构一共有 ______ 个瞬心,其中有 ______ 个绝对瞬心,有 ______ 个相对瞬心。
【简答题】Connie was told that if she worked too hard, her health would ________. A) deteriorate B) descend C) degrade D) decay