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【单选题】
【图片】【图片】其基态时碳1和碳3上的电荷密度各为（ ）A.
2ab ,
B.
2ab ,
C.
,
D.
2ab,
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【单选题】依次填入下列句子横线处的词语.正确的一项是( ) 成熟的荔桂,大多数是深红色或紫色。生在树头,从远处当然看不清它壳面的构造,只有红色映入眼帘, 说它是“绛囊”“红星”“珊瑚珠”, _ _ 很逼真。 整株树以至成片树林,那 成为“飞焰欲横天”“红云几万重”的那样绚丽烂漫的动人景色了。
A.
所以 才 而 就
B.
因而 都 至于 就
C.
所以 才 至于 就
D.
因而 才 而
【简答题】完形填空。 There 1 a nice girl in our middle school. She is in 2 . She is 3 years old. She is not tall and she is short. She has a 4 face like an apple. Her eyes are big, 5 her mouth is small. Her hair is ...
【简答题】BET方程是测定吸附剂的哪一个物理特征的基础( )。 a．孔体积；b．堆密度；c．孔径分布；d．比表面积。
【简答题】请根据句意对划线部分提问，每空一句（含缩写）。 1. I'm thir years old . are you? 2. My brother's favourite colour is blue . brother's colour? 3. She would like three cups of tea . tea she ? 4. Mr. Black goes to work by b...
【简答题】循环球式转向器的结构特点是________级传动副。
【简答题】用方框内所给词的适当形式填空。 write, find, popular, make, careful, is, big, win, last, north 1. We _______ our New Year's resolutions yesterday. 2. I'm _______ a letter to my pen pal. 3. I will ...
【简答题】Practice: Complete the following sentences with there (is / are) or it (is / was) . 1. ________ two birds sitting in that tree. 2. ________ five miles from the station to my house. 3. Don’t cry! _____...
【简答题】根据短文内容，选择正确答案。 One day, a little bear (熊) goes to buy something in Grandpa Hare's shop. There are some bottles of honey (蜂蜜) and many apples on the shelf. (架子) The little bear asks, 'How much is a bot...
【简答题】从II 栏中找出 I 栏的相应答语把编号写在前面的括号中。 I ( )1. How are you? ( )2. What are these? ( )3. What's your name? ( )4. How old are you? ( )5. Is there an apple on the table? ( )6. How many bik...
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