【单选题】
[2]实验室中尽量避免使用剧毒试剂，尽可能使用___试剂代替。
A. 难挥发
B. 无毒或难挥发
C. 低毒或易挥发
D. 低毒或无毒
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答案
D
解析
暂无解析
相关试题
【单选题】
[2]对于危险化学品贮存管理的叙述不正确的是___。
A. 在贮存危险化学品时，应做好防火、防雷、防爆、调温、消除静电等安全措施
B. 在贮存危险化学品时，应做到室内干燥、通风良好
C. 贮存危险化学品时，照明要用防爆型安全灯
D. 贮存危险化学品时，任何人都不得进入库房重地
【单选题】
[1]对于危险化学品贮存管理的叙述不正确的是___。
A. 在贮存危险化学品时，室内应备齐消防器材，如灭火器、水桶、砂子等；室外要有较近的水源
B. 在贮存危险化学品时，化学药品贮存室要由专人保管，并有严格的账目和管理制度
C. 在贮存危险化学品时，室内应干燥、通风良好、温度一般不超过28℃
D. 化学性质不同或灭火方法相抵触的化学药品要存放在地下室同一库房内
【单选题】
[2]对实验室安全用电的叙述不正确的是___。
A. 马弗炉不升温时，应找仪表维修工或电工检查
B. 在安装调试用电仪器通电后，要先检验机壳是否带电
C. 在实验室内有水操作时，要远离电气设备
D. 可以用于直接开关刀闸
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A. from his parents
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C. from the hospital
D. from the doctor who performed the operation
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The meeting between the two families helped to ease the Marshes'suffering because___
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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 ?___
A. She dreamed of going to college .
B. She dreamed of studying animals in Africa .
C. She dreamed of becoming a scientist .
D. She dreamed of traveling all around the world .
【单选题】
What did Goodall's mother think of her dream ?___
A. As a girl she should not go to the African jungle .
B. Her dream would remain a dream unless she got the right training .
C. As a girl she should stay away from violent animals .
D. She could make her dream come true if she was determined .
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Goodall's most important discovery was that___
A. some animals use tools
B. like humans animals have emotions
C. chimpanzees could attack each other violently
D. termites are chimpanzees'favorite food
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Goodall's success is chiefly due to her___
A. exceptional talents
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What is Goodall doing now ?___
A. Studying animal behavior at Cambridge University .
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中国特色社会主义进入新时代,意味着科学社会主义在21世纪的中国焕发出强大生机活力,在世界上高高举起了___伟大旗帜。
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以下关于思想道德和法律的关系表述错误的是___。
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C. 思想道德和法律都是调节人们思想行为、协调人际关系、维护社会秩序的重要手段。
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___是人们的思想观念、政治立场、价值取向、道德情操和行为习惯等方面品质和能力的综合体现，反映着一个人的思想境界和道德风貌。
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“人的本质不是单个人所固有的抽象物，在其现实性上，它是一切社会关系的总和。”这句话说明___
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B. 社会属性是人的本质属性
C. 自然属性和社会属性都是人的本质属性
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马克思运用辩证唯物主义和历史唯物主义的立场、观点和方法，揭开了人的本质之谜，指出人的本质是___。
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B. 一切社会关系的总和
C. 人性本善
D. 人性本恶
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人生目的是人在人生实践中关于自身行为的根本指向和人生追求，它所认识和回答的根本问题是___
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人生态度与人生目的、人生价值的关系是___。
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关于正确幸福观的理解，错误的是___。
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B. 个人的幸福要依靠自己的奋斗，与他人无关。
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D. 精神生活的充实是幸福更重要的方面。
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