【单选题】
一般情况下，煤尘的___越高，越容易爆炸。
A. 灰分#
B. 挥发分#
C. 发热量#
D. 含硫量
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答案
B
解析
暂无解析
相关试题
【单选题】
热电效应就是将金属A和B的两个接点（冷端和热端）之间存在温差时，就在两者之间产生___，在回路中形成（ ）的现象。
A. 电流电压#
B. 电动势电流#
C. 电离子电流#
D. 电子电流
【单选题】
隔爆外壳___情况为失爆。
A. 变形长度超过50毫米，同时凸凹深度小于5毫米#
B. 变形长度超过50毫米，同时凸凹深度大于5毫米#
C. 变形长度小于50毫米，同时凸凹深度小于5毫米#
D. 变形长度小于50毫米，同时凸凹深度小于10毫米
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【单选题】
Q3: What are skiers advised to do to avoid being caught in an avalanche?___
A. Ski only in the official ski areas .
B. Look for solid snow to walk on .
C. Look out for each other while skiing .
D. Learn to control themselves in an avalanche .
【单选题】
Q4: Why does the ski patrol use explosives?___
A. To dig holes in the snow .
B. To close the area for skiing .
C. To make an avalanche move on purpose .
D. To' check how different layers are holding up .
【单选题】
Q1:What is conversation mainly about?___
A. The woman's happy college life the man's doubt .
B. The woman's spending habits and the man's concerns .
C. The man's reminding the woman of the exam this Thursday .
D. The man's support for the woman over the past 15 years .
【单选题】
Q2:What did the woman do last night?___
A. She bought a new leather coat .
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D. She went to a concert with her friends .
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Q3:Where did the woman get the money?___
A. She just received her student loan .
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C. She borrowed the money from her friends .
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【单选题】
Q4:What is the man?___
A. A teacher of biology .
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C. A freshman in biology class .
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Q1: What is this passage mainly about?___
A. How businesses can compete with each other .
B. How small businesses operate during holidays .
C. How small businesses manage holiday workers .
D. How can earn more money during holidays .
【单选题】
Q2: According to Rubin, what can small companies do to thank holiday workers?___
A. Have talks with their families .
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Q3: What can small business owners do to help holiday workers get into the holiday spirit?___
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【单选题】
Q4: Who are supposed to benefit most from this passage?___
A. Workers who have to work during holidays .
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C. Big companies that usually close on holidays .
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【单选题】
In the first two paragraphs of the passage the writer tries to tell us that___
A. he had lived in Washington D.C. for twenty years
B. he was very imaginative when he was a child
C. he had fond memories of his old neighborhood
D. )he had come from a very poor neighborhood
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The writer ,as a child ,was very fond of playing in the basement because ___
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How did the writer feel when he visited his old neighborhood in Washington D.C. ?___
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On his visit to his hometown ,the writer found the old apartment building___
A. see medunfit to live in
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" Youcan never go home again "inthe last sentence of this passage means that___
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We learn from the passage that Tracy died___
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Tracy's parents decided to donate Tracy's organs because___
A. Tracy told them to do so just before he died
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The meeting between the writer's family and Tracy's parents was arranged because___
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The writer and her husband learned how Tracy died___
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The meeting between the two families helped to ease the Marshes'suffering because___
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The writer's first marriage was unsuccessful because___
A. her husband often woke her up at midnight
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When the writer asked for a divorce ,her husband___
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When the writer first met Clint ,she felt that___
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The writer was particularly touched by Clint because___
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The writer's marriage to Clint is important to her mainly because___
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What was Goodall's childhood dream ?___
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【单选题】
What did Goodall's mother think of her dream ?___
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Goodall's most important discovery was that___
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【单选题】
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What is Goodall doing now ?___
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