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【简答题】
Directions: Listen to a talk about a native English speaker's learning experience in his high school years. Choose the best answer to each of the following questions. 1. What did the speaker compare his high school education to? A. Technical school. B. Modern arts college. C. Liberal arts college. 2. What was the most beneficial part for the speaker to take history classes? A. He learned more about history. B. He learned how to write a good essay. C. He gained more cultural awareness. 3. How did the speaker benefit through learning the Spanish language? A. He became a more competent communicator. B. He satisfied the requirements of a foreign language. C. He learned how to speak Spanish fluently. 4. What else did the speaker learn in addition to the things he learned from history and Spanish classes? A. He learned how to read assigned textbooks. B. He learned how to get meaning from texts. C. He learned how to go over every single word in reading. 5. For what purpose did the teacher give students red pens and their own compositions? A. Ask them to learn how to improve communication skills. B. Ask them to learn how to memorize facts and formulas. C. Ask them to learn how to evaluate their own writing critically.
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【判断题】对于提纯的 DNA 样品,测得OD260/OD280小于1.8,则说明样品中含有 RNA
A.
正确
B.
错误
【简答题】对于提纯的DNA样品,测得OD 260 /OD 280 <1.8,则说明样品中含有RNA。(    )
【判断题】对于提纯的DNA样品,测得OD260/OD260为1.8则表明样品中有RNA残留。( )
A.
正确
B.
错误
【判断题】钢的表面热处理主要方法有表面淬火和化学热处理
A.
正确
B.
错误
【简答题】对于提纯的DNA样品,测得OD 260 /OD 280 <1.8,则说明样品中含有RNA。(    )
【判断题】对于提纯的 DNA 样品,测得 OD260/OD280 小于 1.8 ,则说明样品中含有 RNA
A.
正确
B.
错误
【单选题】下列有关勘査的说法中错误的是( )。
A.
勘查现场时,应当邀请与案件无关的公民作为见证人
B.
公安机关对案件现场进行勘查不得 少于2人
C.
紧急情况下,勘查现场,无须持有刑事犯罪现场勘查证
D.
对重大案件的现场进行勘查,应当录像
【判断题】钢的表面热处理方法主要有表面淬火和化学热处理。
A.
正确
B.
错误
【判断题】对于提纯的DNA样品,测得OD260/OD280<1.8,则说明样品中含有RNA。( )
A.
正确
B.
错误
【判断题】对于提纯的DNA样品,测得OD260/OD280<1.8,则说明样品内有RNA
A.
正确
B.
错误
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