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提示标志是向人们提供某种信息(如标明安全设施或场所等)的图形标志。提示标志的基本形式是正方形边框。实验室常用的提示标志有紧急出口、疏散通道方向、灭火器、火警电话等A.
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B.
错误
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【简答题】固定化酶是固定在载体上并在一定的空间范围内进行的（）酶。
【简答题】Bill Gates was born on October 28, 1955. He grew up in Seattle, Washington. He was a very clever boy. His favorite subjects at school were science and math. When he was 13, he started to play with com...
【简答题】He ____ to play ____ before he was 11 years old. A had learned, piano B. had learned, the piano C. has learned, the piano D. learns , piano
【简答题】Read the passage and fill in the blanks with the given words. 阅读下列文章,在空白处填上合适词汇的选项。 A. heavier B. sports C. become D. take E. told Henry, a 17-year-old boy, used to be too fat to p...
【简答题】七、课文填空 (15%) : 1. On Monday, we had a 1 math quiz. I thought it was quite easy and was not 2 3 the results. 2. Afterwards, I got really 4 5 him, and I told him he was not 6 hard enough. He got 7 , 8 i...
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