实验室用氯化钠固体配制1.00mol·L－1的NaCl溶液0.5L，回答下列问题
（1）请写出该实验的实验步骤 ①计算，②称量，③溶解并冷却，④移液，⑤ ，⑥定容，⑦ 摇匀。
（2）所需仪器为：容量瓶、托盘天平、还需要那些玻璃仪器才能完成该实验，请写出： 。
（3）试分析下列操作对所配溶液的浓度有何影响。（填空：A---偏高、B---偏低、C---无影响，填序号） ①为加速固体溶解，可稍微加热并不断搅拌。在未降至室温时，立即将溶液转移至容量瓶定容。对所配溶液浓度的影响：
②定容后，加盖倒转摇匀后，发现液面低于刻度线，又滴加蒸馏水至刻度。对所配溶液浓度的影响
。
（1）⑤洗涤
（2）烧杯、玻璃棒、胶头滴管
（3）①A ②B
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| Mr. Smith is our English teacher. He is about 1.76 meters 1 . He has black hair and two big 2 . He works very hard in the school. Every student likes him very much. He gets up early every day. Then he walks to the 3 . He asks all his students to 4 in the classroom. At eight o'clock 5 begin (开始). Mr. Smith has two classes in the morning and in the other time he checks (检查) the 6 homework. In the afternoon he prepares (准备) his 7 lessons. He is very careful, so his classes are usually interesting. 8 school he plays basketball on the playground. In the evening, he sometimes helps some of his students 9 English at home. And sometimes he writes something. He likes writing. We often 10 his articles (文章) in the newspaper. This is our teacher. We love him. | |||
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