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【单选题】
来自同一总体的两个样本,( )小的样本均数估计总体均数可靠。A.
标准误
B.
变异系数
C.
标准差
D.
极差
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反馈参考答案：
举一反三
【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.
【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.
【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.
【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.
【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...
【多选题】世界的统一性在于它的物质性原理说明
A.
客观存在的现实世界是物质世界
B.
世界上荐在的一切事物和现象都是物质的表现形
C.
意识是物质的产物，不能独立存在
D.
物质是世界上一切变化和发展的基础
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