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阅读短文,选择正确答案。 Are you looking for something fun and would you like to help others in your spare time? Then join us to be a volunteer! We're a non-profit (赢利的) organization. We have volunteer jobs of all ages. Anyone, from twelve-year-old children to people in their seventies can become a volunteer. You can help people in many ways. Schools need help with taking care of children while parents are working. Hospitals need volunteers to look after children while their parents are seeing a doctor. Animal lovers can help take care of those dogs and cats without homes. There is something for everyone. 'As a volunteer, I don't want to get anything. Seeing the children's happy faces, I'm happy, too.' Said Carlos Domingo, an old woman of 62. 'I often played computer games in my spare time before. Now I help older people learn how to use computers.' said another volunteer at the age of 18. If everyone helps out a bit, we'll have a better world to live in. Interested? Call us 1-800-555-5756 or visit our website: www.activol.com. 1. When do the volunteers help others? [     ] A. In their spare time. B. At weekends C. On weekdays. D. In the evenings. 2. _____ can be a volunteer. [     ] A. Children B. Old women C. Anyone aged 12-70 D. Young people 3. Volunteers want to get ______ when they help others. [     ] A. money B. computers C. everything D. nothing 4. Carlos Domingo does volunteer work with ______. [     ] A. animals B. children C. computers D. older people 5. We can read such a passage ______. [     ] A. in a newspaper B. in a storybook C. in a picture book D. in a textbook
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【判断题】过冷是晶核形成的必要条件。()
A.
正确
B.
错误
【简答题】某学生为测定未知浓度的硫酸溶液,实验如下:用1.00mL待测硫酸配制100 mL稀H 2 SO 4 溶液。以0.14mol/L的NaOH溶液滴定上述稀H 2 SO 4 25mL,滴定终止时消耗NaOH溶液15mL,其操作分解为如下几步: A.移取稀H 2 SO 4 25.00 mL,注入洁净的锥形瓶中,并加入2-3滴指示剂。 B.用蒸馏水洗涤滴定管,后用标准溶液润洗2-3次。 C.取标准NaOH溶...
【简答题】某同学配制一定物质的量浓度的NaOH溶液时,如果出现下列情况,会使溶液的物质的量浓度如何变化? (1)所用NaOH固体已潮解,则结果______(填“偏高”“偏低”或“不变”下同) (2)向容量瓶中加蒸馏水时超过了刻度线后,又用滴管把多出的部分吸走,则结果______ (3)小烧杯,玻璃棒未洗净,则结果______ (4)观察刻度线时仰视,则结果______ (5)所用容量瓶中已有少量蒸馏水,则结...
【简答题】某同学配制一定物质的量浓度的NaOH溶液时,如果出现下列情况,会使溶液的物质的量浓度如何变化? (1)所用NaOH固体已潮解,则结果_____(填“偏高”“偏低”或“不变”下同) (2)向容量瓶中加蒸馏水时超过了刻度线后,又用滴管把多出的部分吸走, 则结果 ______ (3)小烧杯,玻璃棒未洗净,则结果 _______ (4)观察刻度线时仰视,则结果 _________ (5)所用容量瓶中已有少...
【简答题】某学生为测定未知浓度的硫酸溶液,实验如下:用1.00mL待测硫酸配制100 mL稀H 2 SO 4 溶液;以0.14 mol/L的NaOH溶液滴定上述稀H 2 SO 4 25.00mL,滴定终止时消耗NaOH溶液15.00mL。 (1)该学生用标准0.14 mol/L NaOH溶液滴定硫酸的实验操作如下: A.用酸式滴定管取稀H 2 SO 4 25.00 mL,注入锥形瓶中,加入指示剂。 B.用待...
【简答题】(15分) (1)某兴趣小组欲准确配制一定物质的量浓度的NaOH溶液:快速准确称取8.0 g 纯净的NaOH固体,配制成100 mL溶液,该NaOH溶液的物质的量浓度为 。所需的仪器除托盘天平、钥匙、小烧杯、玻璃棒外还缺少 。 (2)有机物X由C、H、O三种元素组成的,为确定其结构进行如下实验: a.6.0 g X在一定条件下完全分解,生成3.36 L(标准状况下)一氧化碳和1.8 g水; b.中...
【简答题】液相必须处于一定的过冷条件时方能结晶,而液体中客观存在的 和能量起伏是促成均匀形核的必要因素。
【单选题】实行独立核算的大中型企业、企业化管理的事业单位以及财务收支数额较大、会计业务较多的机关团体和其他组织,都要设置由本单位领导人直接领导的( )
A.
专职会计人员
B.
财务部
C.
会计处
D.
财务会计机构
【单选题】金属结晶的必要条件是( )
A.
过冷度
B.
形核率
C.
成长率
D.
自由能差
【简答题】过冷度是形核的必要条件,而熔液中客观存在的______和______是均匀形核的充分条件,只有满足这三个条件才能形成稳定晶核。
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