问题
单项选择题
()在催化剂表面上的活性吸附是合成氨过程的控制步骤。
A、H2
B、N2
C、NH3
D、CH4
答案
参考答案:B
()在催化剂表面上的活性吸附是合成氨过程的控制步骤。
A、H2
B、N2
C、NH3
D、CH4
参考答案:B
阅读下面短文,把A—D 四个句子填入文中空缺处,使短文内容完整、正确,然后完成第75小题。 ( 每小题2 分, 共10分 ) At school many things happen to us. We may feel excited when we have success in a school play. _____71_____ We want to keep the memory for the rest of our lives. How to keep the memory? Our English teacher, Miss Wang, has taught us a good way of remembering things. It is to make our own yearbook. What is a yearbook? _____72_______ It’s usually made at the end of the year. Last December, we began to make our yearbook. ______73______Then some students interviewed them, some wrote down their stories, others took photos of them. ____74______ Finally, our teacher helped us to put the things together. We had our first yearbook. All of us put a lot of love into making the yearbook. It is so wonderful that not only the students but also our parents and teachers will remember the special time for ever.
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