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【判断题】
金属吸附反应物,若反应物给金属电子,则金属d%越大,吸附越弱。A.
正确
B.
错误
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【简答题】如图，直四棱柱 的底面是边长为１的正方形，侧棱长 ，则异面直线 与 的夹角大小等于___________.
【简答题】Thank you for all your hard work last weekend raising money for Sunny House Old People's Home. We all __ 1 __ a great time and it was nice to see a lot of new volunteers! Here is __ 2 __ we did last w...
【简答题】a. What's really bothering you?b. Well, one thing you could do is offer to help him.c. I know how you feel. We've put a lot of work into it.d. OK, good. You talk to Anita, and let's meet tomorrow and ...
【简答题】阅读下面的材料，掌握其大意，然后从短文后各题所给的A、B、C、D四个选项中，选择 最佳选项。 Thank you for all your hard work last weekend raising (筹款) money for Sunny House Old People's Home. We all __1__ a great time and it was nice to see a lo...
【简答题】已知抛物线 与直线y=x+2相交于A、B两点，过A、B两点的切线分别为 和 。 （1）求A、B两点的坐标； （2）求直线 与 的夹角。
【简答题】Last week, students at Rosie Bridge School worked hard to make their English Week very successful. There 1 a lot of activities including an English book fair in the library and a treasure hunt. 2 stud...
【简答题】（本题满分12分）三棱锥 中， ， ， ． （Ⅰ）求证：平面 平面 ； （Ⅱ）若 ，且异面直线 与 的夹角为 时，求二面角 的余弦值．
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