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分析比较物质在组成、性质等方面的异同，可为物质的分离和鉴别提供依据． （1）从组成上看，BaCl 2 、NaCl都含有______元素，但BaSO 4 不含有； （2）将BaSO 4 、BaCl 2 、NaCl三种固体组成的混合物溶于足量的，充分搅拌后过滤，留在滤纸上的固体是______； （3）根据BaCl 2 溶液和NaCl溶液中的金属离子不同，可用稀硫酸将NaCl溶液和BaCl 2 溶液鉴别开．请写出稀硫酸和BaCl 2 反应的化学方程式______； （4）按如下方案分离BaCl 2 和NaCl的固体混合物时，X溶液中溶质是______． A．K 2 CO 3 B．Na 2 CO 3 C． Na 2 SO 4 ．
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参考答案：
举一反三
【单选题】“细身”指的是下面哪一世界:()
A.
世俗世界
B.
有话世界
C.
有情世界
D.
有器世界
查看完整题目与答案
【单选题】The jury has the power to ______ or acquit.
A.
convict
B.
accuse
C.
charge
D.
try
查看完整题目与答案
【判断题】远期付款交单和即期付款交单的交单条件是相同的：买方不付款就不能取得代表货物所有权的单据，所以卖方承担的风险责任基本上没有变化。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What does the term 'behavior' in the second paragraph especially refer to in this passage?
A.
It refers to observable and physical movements and acts.
B.
It refers to the part of language behavior. that involves understanding or interpretation.
C.
If refers to both the overt and the unobservable language behaviors in communicating.
D.
If refers to acts of speaking and writing.
查看完整题目与答案
【单选题】听力原文： A jury has found former French official Maurice Mapont guilty of crimes against humanity for expelling Jews during World War II. Mapont was sentenced to ten years in prison. The sentence ended t...
A.
expelling Jews during World War Ⅱ
B.
killing Jews during World War Ⅱ
C.
murdering Jews during World War Ⅱ
D.
torturing Jews during World War Ⅱ
查看完整题目与答案
【单选题】( )是企业管理机制的核心,是销售团队的指挥棒
A.
销售目标
B.
内部组织和职能界定
C.
薪酬考核
D.
外部市场
E.
销售计划
查看完整题目与答案
【单选题】The jury has taken its decision, _____?
A.
haven't they
B.
hasn't it
C.
have they
D.
has it
查看完整题目与答案
【简答题】Java语言对Java源文件的名称和类的名称约束是?
查看完整题目与答案
【单选题】A jury in Northern California has found a physician【C1】______ for elder abuse because he failed to 【C2】______ enough pain medication for a【C3】______ ill patient, William Bergman. The jury awarded one-...
A.
liable
B.
invalid
C.
illegal
D.
guilty
查看完整题目与答案
【单选题】The______has the right to determine whether the evidence is believable or not
A.
judge
B.
jury
C.
court
D.
attorney
查看完整题目与答案
相关题目：
【单选题】“细身”指的是下面哪一世界:()
A.
世俗世界
B.
有话世界
C.
有情世界
D.
有器世界
查看完整题目与答案
【单选题】The jury has the power to ______ or acquit.
A.
convict
B.
accuse
C.
charge
D.
try
查看完整题目与答案
【判断题】远期付款交单和即期付款交单的交单条件是相同的：买方不付款就不能取得代表货物所有权的单据，所以卖方承担的风险责任基本上没有变化。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What does the term 'behavior' in the second paragraph especially refer to in this passage?
A.
It refers to observable and physical movements and acts.
B.
It refers to the part of language behavior. that involves understanding or interpretation.
C.
If refers to both the overt and the unobservable language behaviors in communicating.
D.
If refers to acts of speaking and writing.
查看完整题目与答案
【单选题】听力原文： A jury has found former French official Maurice Mapont guilty of crimes against humanity for expelling Jews during World War II. Mapont was sentenced to ten years in prison. The sentence ended t...
A.
expelling Jews during World War Ⅱ
B.
killing Jews during World War Ⅱ
C.
murdering Jews during World War Ⅱ
D.
torturing Jews during World War Ⅱ
查看完整题目与答案
【单选题】( )是企业管理机制的核心,是销售团队的指挥棒
A.
销售目标
B.
内部组织和职能界定
C.
薪酬考核
D.
外部市场
E.
销售计划
查看完整题目与答案
【单选题】The jury has taken its decision, _____?
A.
haven't they
B.
hasn't it
C.
have they
D.
has it
查看完整题目与答案
【简答题】Java语言对Java源文件的名称和类的名称约束是?
查看完整题目与答案
【单选题】A jury in Northern California has found a physician【C1】______ for elder abuse because he failed to 【C2】______ enough pain medication for a【C3】______ ill patient, William Bergman. The jury awarded one-...
A.
liable
B.
invalid
C.
illegal
D.
guilty
查看完整题目与答案
【单选题】The______has the right to determine whether the evidence is believable or not
A.
judge
B.
jury
C.
court
D.
attorney
查看完整题目与答案
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