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盐酸和硫酸是实验室里常用的试剂，现有两瓶没有标签的稀盐酸和稀硫酸，请你设计出三种不同的实验方案来鉴别它们，并要求三种方案的实验现象不相同． 项目 实验步骤 实验现象和结论 方案1 方案2 方案3
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举一反三
【单选题】“阴阳离决，精气乃绝”阐述的阴阳关系是
A.
阴阳消长
B.
阴阳交感
C.
阴阳转化
D.
阴阳对立
E.
阴阳互根
查看完整题目与答案
【单选题】女,45岁,有心肌缺血病史,经治疗后几年来一直健康。近曰突然出现心慌,气短,数
A.
后能自然缓解，如此，每日可发作数次，发作时常伴有心绞痛的症状。经心电图检查诊断为阵发性室上性心动过速，此时最好选用(    )
B.
普鲁卡因胺
C.
硝苯地平
D.
维拉帕米
E.
索他洛尔
F.
普罗帕酮
查看完整题目与答案
【单选题】—How did you find the fashion show? —_______________.
A.
A friend of mine showed me the way
B.
It was fascinating
C.
The designer invited me
D.
By taking a No.11 bus
查看完整题目与答案
【单选题】How Did She Conquer the Americans? African-American talk show queen Oprah Winfrey is the world's most powefful celebrity, according to Forbes magazine._________(46)Winfrey, 51, draws 30 million viewer...
A.
But it also looks at the celebrity's presence on the Internet and in the media.
B.
In 1991, she did a lot of work for the National Child Protection Act.
C.
She was not a very successful woman.
D.
She began broadcasting while still at high school.
E.
Itplaced Winfrey at the top of its annual ranking of the 100 people last week.
F.
The couple had been tight-lipped about their break-up. 第 47 题 请选择（46）处的最佳答案．
查看完整题目与答案
【单选题】(单项选择题)旅游团住店期间楼层发生火灾,游客在撤离过程中,()操作是错误的。
A.
要轻装、快捷、有序、不要拥挤
B.
要听从工作人员指挥，从安全门撤离
C.
切忌关上身后的门，给其他游客一个逃生的指示
D.
切勿返回房间内拿东西
查看完整题目与答案
【单选题】听力原文： A Russian cargo ship with about 30 crew members aboard was in danger of sinking off Russia's eastern coast while stormy weather interfered with rescue efforts, state-run Itar-Tass news agency sa...
A.
No explanation of the problem.
B.
Long distance away from land.
C.
Slow rescue efforts.
D.
Severe weather.
查看完整题目与答案
【单选题】Who did the teacher have _______ how _______ the computer?
A.
to show, to use
B.
showed, use
C.
shown, using
D.
show, to use
查看完整题目与答案
【单选题】女性，45岁，有心肌缺血病史，经治疗后几年来一直健康。近日突然出现心慌、气短，数分钟后能自然缓解，每日可发作数次，发作时常伴有心绞痛的症状。经心电图检查认为阵发性室上性心动过速。此时最好选用（ ）
A.
硝苯地平
B.
普鲁卡因胺
C.
维拉帕米
D.
索他洛尔
E.
普罗帕酮
查看完整题目与答案
【单选题】听力原文： Alaska which was called Russian America before it was sold to the United States of America joined the Union as the Forty-ninth state in 1959. Alaska is now the largest of all the 50 states Hawai...
A.
In 1869.
B.
In 1959.
C.
In 1867.
D.
In 1872.
查看完整题目与答案
【单选题】患者，女性，45岁。有心肌缺血病史，经治疗后几年来一直健康。近日突然出现心慌、气短，数分钟后自然缓解，每日发作数次，发作时常伴有心绞痛症状。经心电图检查认为阵发性室上性心动过速，此时最好选用
A.
普鲁卡因胺
B.
硝苯地平
C.
维拉帕米
D.
索他洛尔
E.
普罗帕酮
查看完整题目与答案
相关题目：
【单选题】“阴阳离决，精气乃绝”阐述的阴阳关系是
A.
阴阳消长
B.
阴阳交感
C.
阴阳转化
D.
阴阳对立
E.
阴阳互根
查看完整题目与答案
【单选题】女,45岁,有心肌缺血病史,经治疗后几年来一直健康。近曰突然出现心慌,气短,数
A.
后能自然缓解，如此，每日可发作数次，发作时常伴有心绞痛的症状。经心电图检查诊断为阵发性室上性心动过速，此时最好选用(    )
B.
普鲁卡因胺
C.
硝苯地平
D.
维拉帕米
E.
索他洛尔
F.
普罗帕酮
查看完整题目与答案
【单选题】—How did you find the fashion show? —_______________.
A.
A friend of mine showed me the way
B.
It was fascinating
C.
The designer invited me
D.
By taking a No.11 bus
查看完整题目与答案
【单选题】How Did She Conquer the Americans? African-American talk show queen Oprah Winfrey is the world's most powefful celebrity, according to Forbes magazine._________(46)Winfrey, 51, draws 30 million viewer...
A.
But it also looks at the celebrity's presence on the Internet and in the media.
B.
In 1991, she did a lot of work for the National Child Protection Act.
C.
She was not a very successful woman.
D.
She began broadcasting while still at high school.
E.
Itplaced Winfrey at the top of its annual ranking of the 100 people last week.
F.
The couple had been tight-lipped about their break-up. 第 47 题 请选择（46）处的最佳答案．
查看完整题目与答案
【单选题】(单项选择题)旅游团住店期间楼层发生火灾,游客在撤离过程中,()操作是错误的。
A.
要轻装、快捷、有序、不要拥挤
B.
要听从工作人员指挥，从安全门撤离
C.
切忌关上身后的门，给其他游客一个逃生的指示
D.
切勿返回房间内拿东西
查看完整题目与答案
【单选题】听力原文： A Russian cargo ship with about 30 crew members aboard was in danger of sinking off Russia's eastern coast while stormy weather interfered with rescue efforts, state-run Itar-Tass news agency sa...
A.
No explanation of the problem.
B.
Long distance away from land.
C.
Slow rescue efforts.
D.
Severe weather.
查看完整题目与答案
【单选题】Who did the teacher have _______ how _______ the computer?
A.
to show, to use
B.
showed, use
C.
shown, using
D.
show, to use
查看完整题目与答案
【单选题】女性，45岁，有心肌缺血病史，经治疗后几年来一直健康。近日突然出现心慌、气短，数分钟后能自然缓解，每日可发作数次，发作时常伴有心绞痛的症状。经心电图检查认为阵发性室上性心动过速。此时最好选用（ ）
A.
硝苯地平
B.
普鲁卡因胺
C.
维拉帕米
D.
索他洛尔
E.
普罗帕酮
查看完整题目与答案
【单选题】听力原文： Alaska which was called Russian America before it was sold to the United States of America joined the Union as the Forty-ninth state in 1959. Alaska is now the largest of all the 50 states Hawai...
A.
In 1869.
B.
In 1959.
C.
In 1867.
D.
In 1872.
查看完整题目与答案
【单选题】患者，女性，45岁。有心肌缺血病史，经治疗后几年来一直健康。近日突然出现心慌、气短，数分钟后自然缓解，每日发作数次，发作时常伴有心绞痛症状。经心电图检查认为阵发性室上性心动过速，此时最好选用
A.
普鲁卡因胺
B.
硝苯地平
C.
维拉帕米
D.
索他洛尔
E.
普罗帕酮
查看完整题目与答案