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【单选题】
下列能使红细胞发生皱缩的溶液是:( )
A.
12.5g ·L -1 NaHCO 3
B.
1.0g ·L -1 NaCl
C.
9.0 g ·L -1 NaCl
D.
100g ·L -1 葡萄糖
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【单选题】27 以下关于旅游活动中溺水事故预防的说法中,不正确的是( )
A.
在旅游活动中，导游员要劝阻旅游者不要单独去偏僻或水清不明的地方游泳
B.
旅游团集体游泳时导游员应提醒旅游者在下水前要做好准备活动，以防抽筋
C.
导游员要提醒身体过度疲劳、过饱过饿的旅游者下水游泳时要特别注意安全问题
D.
组织水上漂流活动时，应安排旅游者穿好救生衣，安放好随身携带物品
查看完整题目与答案
【单选题】世界的统一性在于它的
A.
物质性
B.
存在性
C.
可知性
D.
运动性
查看完整题目与答案
【单选题】According to the conversation, what upsets the man?
A.
He doesn't know what color to choose.
B.
He has a broken rucksack.
C.
The gift he wants is out of stock.
D.
He doesn't know what gift will be useful.
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【单选题】What aren't there that night according to the man?
A.
Films.
B.
Plays.
C.
Concerts.
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【简答题】Choose the right answer according to what you hear. 1. Jim forgot _____. A. the lesson B. what the teacher said C. what his mother said 2. The story happened _____. A. in the evening B. in the afterno...
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【单选题】What can you learn according to what you hear?
A.
The man doesn't like country music, but he has to learn.
B.
The man didn't know the bad news.
C.
The man didn't like John Denver.
查看完整题目与答案
【单选题】On what occasion will people notice the importance of nonverbal communication, according to the passage?
A.
When you have an interview with the manager.
B.
When you are .in a foreign country which language you can't understand.
C.
When you .are having a face to face communication.
D.
When you stand with somebody.
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【单选题】下列各组液体混合物,用分液漏斗不能分离的是
A.
溴乙烷和水
B.
氯乙烷和稀盐酸
C.
甲苯和水
D.
苯和溴苯
查看完整题目与答案
【单选题】What is the most important thing to overcome nervousness according to the woman?
A.
Don't be afraid of failing.
B.
Work very hard.
C.
Don't take it seriously.
查看完整题目与答案
【简答题】（14分）常见的一硝基甲苯有对硝基甲苯和邻硝基甲苯两种，均可用于合成各种染料。某探究小组利用下列反应和装置制备一硝基甲苯。 实验中可能用到的数据： 实验步骤：①按体积比1：3配制浓硫酸与浓硝酸混合物40 mL； ②在三颈瓶中加入15 mL(13g)甲苯，按图所示装好药品和其他仪器； ③向三颈瓶中加入混酸，并不断搅拌（磁力搅拌器已略去）； ④控制温度约为50℃，反应大约10 min，三颈瓶底有大量淡...
查看完整题目与答案
相关题目：
【单选题】27 以下关于旅游活动中溺水事故预防的说法中,不正确的是( )
A.
在旅游活动中，导游员要劝阻旅游者不要单独去偏僻或水清不明的地方游泳
B.
旅游团集体游泳时导游员应提醒旅游者在下水前要做好准备活动，以防抽筋
C.
导游员要提醒身体过度疲劳、过饱过饿的旅游者下水游泳时要特别注意安全问题
D.
组织水上漂流活动时，应安排旅游者穿好救生衣，安放好随身携带物品
查看完整题目与答案
【单选题】世界的统一性在于它的
A.
物质性
B.
存在性
C.
可知性
D.
运动性
查看完整题目与答案
【单选题】According to the conversation, what upsets the man?
A.
He doesn't know what color to choose.
B.
He has a broken rucksack.
C.
The gift he wants is out of stock.
D.
He doesn't know what gift will be useful.
查看完整题目与答案
【单选题】What aren't there that night according to the man?
A.
Films.
B.
Plays.
C.
Concerts.
查看完整题目与答案
【简答题】Choose the right answer according to what you hear. 1. Jim forgot _____. A. the lesson B. what the teacher said C. what his mother said 2. The story happened _____. A. in the evening B. in the afterno...
查看完整题目与答案
【单选题】What can you learn according to what you hear?
A.
The man doesn't like country music, but he has to learn.
B.
The man didn't know the bad news.
C.
The man didn't like John Denver.
查看完整题目与答案
【单选题】On what occasion will people notice the importance of nonverbal communication, according to the passage?
A.
When you have an interview with the manager.
B.
When you are .in a foreign country which language you can't understand.
C.
When you .are having a face to face communication.
D.
When you stand with somebody.
查看完整题目与答案
【单选题】下列各组液体混合物,用分液漏斗不能分离的是
A.
溴乙烷和水
B.
氯乙烷和稀盐酸
C.
甲苯和水
D.
苯和溴苯
查看完整题目与答案
【单选题】What is the most important thing to overcome nervousness according to the woman?
A.
Don't be afraid of failing.
B.
Work very hard.
C.
Don't take it seriously.
查看完整题目与答案
【简答题】（14分）常见的一硝基甲苯有对硝基甲苯和邻硝基甲苯两种，均可用于合成各种染料。某探究小组利用下列反应和装置制备一硝基甲苯。 实验中可能用到的数据： 实验步骤：①按体积比1：3配制浓硫酸与浓硝酸混合物40 mL； ②在三颈瓶中加入15 mL(13g)甲苯，按图所示装好药品和其他仪器； ③向三颈瓶中加入混酸，并不断搅拌（磁力搅拌器已略去）； ④控制温度约为50℃，反应大约10 min，三颈瓶底有大量淡...
查看完整题目与答案