问题
选择题
______ they are very tired, they feel happy because they've finally finished their project. [ ]
A. So
B. Although
C. If
D. But
答案
答案：B
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______ they are very tired, they feel happy because they've finally finished their project. [ ]
A. So
B. Although
C. If
D. But
答案：B
的滑块A放于水平地面上.把质量为m的滑块B放在A的斜面上.忽略一切摩擦,有人求得B相对地面的加速度a=
,式中g为重力加速度.对于上述解,某同学首先分析了等号右侧量的单位,没发现问题.他进一步利用特殊条件对该解做了如下四项分析和判断,所得结论都是“解可能是对的”.但是,其中有一项是错误的.请你指出该项
时,该解给出a=0,这符合常识,说明该解可能是对的