皮皮学，免费搜题
登录
搜题
【简答题】
实验需要0.10mol/LNaOH溶液470mL，根据溶液配制中情况回答下列问题： （1）实验中除了托盘天平、烧杯、玻璃棒、量筒、药匙外还需要的其它仪器有： 。 （2）根据计算得知，所需NaOH的质量为 g。 （3），待容量瓶中溶液的凹液面正好与刻度线相切，瓶塞后的下一步操作是 。 （4）,若加入的水超过刻度线，必须采取的措施是： 。 （5）下列操作对所配浓度有何影响（填写字母） 偏低的有 ；无影响的有 。 A．称量用了生锈的砝码； B．将NaOH放在纸张上称量； C．NaOH在烧杯中溶解后，未冷却就立即转移到容量瓶中； D．俯视刻度线 E、容量瓶未干燥即用来配制溶液
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
【简答题】设A,B是阶矩阵,且A经若干初等变换化为B,则下面论断正确的是____。 A) 存在初等矩阵P 1 ,P 2 ,...,P t ,使B=P 1 P 2 ...P t A B) 存在初等矩阵Q 1 ,Q 2 ,...,Q t ,使B=AQ 1 Q 2 ...Q t C) 存在可逆矩阵P、Q,使B=PAQ D) 存在可逆矩阵P 1 、Q 1 ,使A=P 1 BQ 1
查看完整题目与答案
【单选题】N1 What is the news
A.
B.
C.
D.
D
查看完整题目与答案
【单选题】News Directions N1-1
A.
To debate on the use of elephants.
B.
To campaign against the use of elephants.
C.
To pop the champagne corks and rejoice.
D.
To stop using performing elephants.
查看完整题目与答案
【单选题】News: Directions News 1: N1-1
A.
To debate on the use of elephants.
B.
To campaign against the use of elephants.
C.
To pop the champagne corks and rejoice.
D.
To stop using performing elephants.
查看完整题目与答案
【单选题】News 2 N2-3
A.
Americans built support for laws forbidding voter discrimination.
B.
Discrimination against African-American voters came to an end.
C.
Existence of discrimination in the United States continued.
D.
Activists helped clear the path he followed to the White House.
查看完整题目与答案
【单选题】News 3 N3-5
A.
Albina’s son was killed in a helicopter accident.
B.
Albina’s son lost his life at age 25 in a mission in Mali.
C.
Albina’s son was a very dedicated search-and-rescue pilot.
D.
Albina’s son lost his life in a mission in 1986.
查看完整题目与答案
【单选题】News Reports: Directions News Item One N1-1
A.
Positive effect.
B.
Negligible effect.
C.
Negative effect.
D.
Dramatic effect.
查看完整题目与答案
【单选题】News 3 N3-5
A.
Participate in the Olympics.
B.
Participate in the Paralympics.
C.
Participate in a swimming contest.
D.
Participate in a basketball game.
查看完整题目与答案
【单选题】设A为可逆矩阵，则与A必有相同特征值的矩阵是()。
A.
AT
B.
A2
C.
A-1
D.
A*
查看完整题目与答案
【简答题】News report One(20190601N1)
查看完整题目与答案
相关题目：
【简答题】设A,B是阶矩阵,且A经若干初等变换化为B,则下面论断正确的是____。 A) 存在初等矩阵P 1 ,P 2 ,...,P t ,使B=P 1 P 2 ...P t A B) 存在初等矩阵Q 1 ,Q 2 ,...,Q t ,使B=AQ 1 Q 2 ...Q t C) 存在可逆矩阵P、Q,使B=PAQ D) 存在可逆矩阵P 1 、Q 1 ,使A=P 1 BQ 1
查看完整题目与答案
【单选题】N1 What is the news
A.
B.
C.
D.
D
查看完整题目与答案
【单选题】News Directions N1-1
A.
To debate on the use of elephants.
B.
To campaign against the use of elephants.
C.
To pop the champagne corks and rejoice.
D.
To stop using performing elephants.
查看完整题目与答案
【单选题】News: Directions News 1: N1-1
A.
To debate on the use of elephants.
B.
To campaign against the use of elephants.
C.
To pop the champagne corks and rejoice.
D.
To stop using performing elephants.
查看完整题目与答案
【单选题】News 2 N2-3
A.
Americans built support for laws forbidding voter discrimination.
B.
Discrimination against African-American voters came to an end.
C.
Existence of discrimination in the United States continued.
D.
Activists helped clear the path he followed to the White House.
查看完整题目与答案
【单选题】News 3 N3-5
A.
Albina’s son was killed in a helicopter accident.
B.
Albina’s son lost his life at age 25 in a mission in Mali.
C.
Albina’s son was a very dedicated search-and-rescue pilot.
D.
Albina’s son lost his life in a mission in 1986.
查看完整题目与答案
【单选题】News Reports: Directions News Item One N1-1
A.
Positive effect.
B.
Negligible effect.
C.
Negative effect.
D.
Dramatic effect.
查看完整题目与答案
【单选题】News 3 N3-5
A.
Participate in the Olympics.
B.
Participate in the Paralympics.
C.
Participate in a swimming contest.
D.
Participate in a basketball game.
查看完整题目与答案
【单选题】设A为可逆矩阵，则与A必有相同特征值的矩阵是()。
A.
AT
B.
A2
C.
A-1
D.
A*
查看完整题目与答案
【简答题】News report One(20190601N1)
查看完整题目与答案