【单选题】The number of the people who can afford to buy their own house ______ more than 60%,but a number of houses _______.
A.
are; hasn’t been built
C.
is; haven’t been built
【简答题】A.People who listen to the radio also buy newspapers. B.Radio is a substitute for newspapers in people's homes. C.Newspapers discourage people from listening to the radio. D.Many newspaper reporters a...
【判断题】The people who buy advertising are the suppliers .
【简答题】某同学用如图 1 - 2 - 5 所示装置来验证动量守恒定律,让质量为 m1 的小球从斜槽某处由静止开始滚下,与静止在斜槽末端质量为 m2 的小球发生碰撞. (1) 实验中必须要求的条件是 ________ . A .斜槽必须是光滑的 B .斜槽末端的切线必须水平 C . m1 与 m2 的球心在碰撞瞬间必须在同一高度 D . m1 每次必须从同一高度处滚下 (2) 实验中必须测量的物理量是 __...
【简答题】Occasionally people who buy a product find ways of using it that get around the necessity of buying more ______.
【简答题】基于于活动理论的教学模式主要内容包括分析、设计、实施与评价,其中设计阶段主要包括:_____的设计、______的设计、_______ 的设计、________的设计和_________的设计。
【简答题】一质量为 小球,在距离地面高度为 处静止自由下落,与地面发生碰撞后,碰撞的时间为 ,碰撞后反弹竖直上升到距离地面高度为 的地方,则地面对小球的平均作用力大小为( )。不忽略重力,取 。