皮皮学，免费搜题
登录
搜题
【简答题】
（9分）实验室需要0.2mol/L的CuSO 4 溶液480mL，现配制该溶液，实验操作步骤： A．用托盘天平称取 gCuSO 4 ·5H 2 O晶体，放在烧杯中，用 适量的蒸馏水使它溶解并恢复至室温。 B．用蒸馏水洗烧杯和玻璃棒2—3次，每次洗涤液都小心注入容量瓶，并轻轻振荡 C．继续向容量瓶加蒸馏水，至液面距刻度线1cm~2cm处，改用胶头滴管小心滴加蒸馏水至溶液凹液面最低处与刻度线相切。 D．将制得的溶液通过玻璃棒引流，小心地移至容量瓶中。 E．将瓶塞塞紧，反复上下颠倒，摇匀。 请填写下列空白： （1）需称 gCuSO 4 ·5H 2 O晶体 （2）操作步骤的正确顺序为 （填序号） （3）本实验用到的基本仪器已有烧杯、天平（砝码、镊子）、药匙， 还缺少的仪器是 、 、 。 （4）下列情况会使所配溶液浓度偏低的是 （填序号） a.俯视。                       b.没有进行上述的操作步骤B c.加蒸馏水时， 不慎超过了刻度线       d.砝码上沾有杂质（或者使用生锈的砝码） e.容量瓶使前未经干燥。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【单选题】(一)下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答以下问题，在备选答案中选取正确答案。 76.从基期到报告期，该企业全部工人平均工资的增长率是( )。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【单选题】What did Claudius want to do when he was the Emperor of Rome?
A.
He wanted to expand the roman Empire
B.
He wanted to conquer the world
C.
He wanted to increase the size of his army.
D.
He wanted to increase the size of his family
查看完整题目与答案
【单选题】下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答以下问题，在备选答案中选取正确答案。 从基期到报告期，该企业全部工人平均工资的增长率是( )。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【简答题】Many viewers enjoy trying to “spot” his short cameo appearances in all of his movies.(翻译)
查看完整题目与答案
【单选题】Which of the following is true about all the movies that will be presented at the Venice Film Festival?
A.
They have never been shown in their own countries.
B.
They have been shown in their own countries and other regions as well.
C.
They have only been shown in their own countries.
D.
They have entered the other International Film Festivals.
查看完整题目与答案
【简答题】这是近期一场NBA篮球赛的一张图片,当时詹姆斯正在津津有味的吃糖果,但这一举动却为该品牌间接带来500多万美元的收入。你认为球员该举动是有意的还是无意的?试着收集相关资料,进行分析。
查看完整题目与答案
【判断题】车载网络系统中的架构要有特定的通信协议。
A.
正确
B.
错误
查看完整题目与答案
【单选题】（一）下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答以下问题，在备选答案中选取正确答案。 从基期到报告期，该企业全部工人平均工资的增长率是（ ）。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【单选题】下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答 76～80 题，在备选答案中选取正确答案。 第 76 题 从基期到报告期，该企业全部工人平均工资的增长率是（ ）。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【单选题】What did Claudius want to do when he was the Emperor of Rome?
A.
He wanted to expand the Roman Empire.
B.
He wanted to conquer the world.
C.
He wanted to increase the size to his army.
D.
He wanted to increase the size of his family.
查看完整题目与答案
相关题目：
【单选题】(一)下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答以下问题，在备选答案中选取正确答案。 76.从基期到报告期，该企业全部工人平均工资的增长率是( )。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【单选题】What did Claudius want to do when he was the Emperor of Rome?
A.
He wanted to expand the roman Empire
B.
He wanted to conquer the world
C.
He wanted to increase the size of his army.
D.
He wanted to increase the size of his family
查看完整题目与答案
【单选题】下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答以下问题，在备选答案中选取正确答案。 从基期到报告期，该企业全部工人平均工资的增长率是( )。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【简答题】Many viewers enjoy trying to “spot” his short cameo appearances in all of his movies.(翻译)
查看完整题目与答案
【单选题】Which of the following is true about all the movies that will be presented at the Venice Film Festival?
A.
They have never been shown in their own countries.
B.
They have been shown in their own countries and other regions as well.
C.
They have only been shown in their own countries.
D.
They have entered the other International Film Festivals.
查看完整题目与答案
【简答题】这是近期一场NBA篮球赛的一张图片,当时詹姆斯正在津津有味的吃糖果,但这一举动却为该品牌间接带来500多万美元的收入。你认为球员该举动是有意的还是无意的?试着收集相关资料,进行分析。
查看完整题目与答案
【判断题】车载网络系统中的架构要有特定的通信协议。
A.
正确
B.
错误
查看完整题目与答案
【单选题】（一）下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答以下问题，在备选答案中选取正确答案。 从基期到报告期，该企业全部工人平均工资的增长率是（ ）。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【单选题】下表是某企业按男、女分组的工人人数和工资资料。请据此计算并回答 76～80 题，在备选答案中选取正确答案。 第 76 题 从基期到报告期，该企业全部工人平均工资的增长率是（ ）。
A.
111.76%
B.
122.5%
C.
11.76%
D.
22.5%
查看完整题目与答案
【单选题】What did Claudius want to do when he was the Emperor of Rome?
A.
He wanted to expand the Roman Empire.
B.
He wanted to conquer the world.
C.
He wanted to increase the size to his army.
D.
He wanted to increase the size of his family.
查看完整题目与答案