皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【多选题】
称取混合碱(碳酸盐) 2.4000g ,溶解稀释至 250mL ,取两份 25.00mL 溶液,一份以酚酞为指示剂,耗去 0.1000mol/L HCl 30.00mL ,另一份以甲基橙为指示剂,耗去 HCl 35.00mL ,则下列说法正确的是( ) Mr ( Na 2 CO 3 ) =105.99 ; Mr ( NaHCO 3 ) =84.01 : Mr ( NaOH ) =40.01 )
A.
该混合碱由 Na 2 CO 3 和 NaHCO 3 3 组成
B.
该混合碱由 Na 2 CO 3 3 和 NaOH 3 组成
C.
Na 2 CO 3 含量32.53% NaHCO 3 3 含量37.23%
D.
Na 2 CO 3 含量 22.08% NaOH 含量 41.68%
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【单选题】从兰州托运包裹至石家庄（1599公里）运到期限为（）天
A.
1
B.
2
C.
6
D.
4
查看完整题目与答案
【单选题】_____ being prepared for the flight, the crew also ensure that all passengers know safety matters.
A.
Beside
B.
Not only
C.
As well as
D.
In addition
查看完整题目与答案
【单选题】The writer of this passage refers to the history of money in order to ______.
A.
show that silver and gold are previous metals
B.
show that one should convert paper money to gold
C.
explain the nature of money
D.
show that anything can serve as money in modern times
查看完整题目与答案
【多选题】For the members of staff aboard a commercial aircraft, employed to ensure the safety and comfort of their passengers, we usually call them:
A.
cabin crew
B.
waitress
C.
crew member
D.
flight attendents
查看完整题目与答案
【多选题】我国信息安全面临的主要威胁有（）。
A.
主要技术依赖进口
B.
信息安全的防护能力较弱
C.
各级信息安全管理机构尚不完善
D.
信息安全意识亟待提高
查看完整题目与答案
【单选题】我国信息安全面临的威胁有( ) 1主要技术依赖进口,信息产业受制于人 2信息安全的防护能力较弱 3信息安全管理机构尚不完善 4信息安全意识亟待提高 5信息传播速度急剧加快
A.
①②③④⑤
B.
①②③④
C.
①②③⑤
D.
②③④⑤
查看完整题目与答案
【单选题】The reservation agent a window seat for him on the flight.
A.
book
B.
reserving
C.
assigned
D.
safety
查看完整题目与答案
【单选题】The writer of this passage refers to the history of money in order to ______________.
A.
show that silver and gold are previous metals
B.
show that one should convert paper money to gold
C.
explain the nature of money
D.
show that anything can serve as money in modem times
查看完整题目与答案
【简答题】信息安全面临的主要威胁有哪些?
查看完整题目与答案
【简答题】信息安全面临的主要威胁有哪些?
查看完整题目与答案
相关题目：
【单选题】从兰州托运包裹至石家庄（1599公里）运到期限为（）天
A.
1
B.
2
C.
6
D.
4
查看完整题目与答案
【单选题】_____ being prepared for the flight, the crew also ensure that all passengers know safety matters.
A.
Beside
B.
Not only
C.
As well as
D.
In addition
查看完整题目与答案
【单选题】The writer of this passage refers to the history of money in order to ______.
A.
show that silver and gold are previous metals
B.
show that one should convert paper money to gold
C.
explain the nature of money
D.
show that anything can serve as money in modern times
查看完整题目与答案
【多选题】For the members of staff aboard a commercial aircraft, employed to ensure the safety and comfort of their passengers, we usually call them:
A.
cabin crew
B.
waitress
C.
crew member
D.
flight attendents
查看完整题目与答案
【多选题】我国信息安全面临的主要威胁有（）。
A.
主要技术依赖进口
B.
信息安全的防护能力较弱
C.
各级信息安全管理机构尚不完善
D.
信息安全意识亟待提高
查看完整题目与答案
【单选题】我国信息安全面临的威胁有( ) 1主要技术依赖进口,信息产业受制于人 2信息安全的防护能力较弱 3信息安全管理机构尚不完善 4信息安全意识亟待提高 5信息传播速度急剧加快
A.
①②③④⑤
B.
①②③④
C.
①②③⑤
D.
②③④⑤
查看完整题目与答案
【单选题】The reservation agent a window seat for him on the flight.
A.
book
B.
reserving
C.
assigned
D.
safety
查看完整题目与答案
【单选题】The writer of this passage refers to the history of money in order to ______________.
A.
show that silver and gold are previous metals
B.
show that one should convert paper money to gold
C.
explain the nature of money
D.
show that anything can serve as money in modem times
查看完整题目与答案
【简答题】信息安全面临的主要威胁有哪些?
查看完整题目与答案
【简答题】信息安全面临的主要威胁有哪些?
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题