甲、乙、丙、丁4种物质均为只含有两种元素的化合物,其分子中均含有18个电子,下列说法

题型:单项选择题

问题:

甲、乙、丙、丁4种物质均为只含有两种元素的化合物,其分子中均含有18个电子,下列说法中正确的是()。

A.若气体甲的水溶液在常温下的pH<7,则甲一定为HCl

B.若乙的摩尔质量与O2相同,则乙一定为N2H4

C.若3.0g丙的物质的量为0.1mol,则丙一定为甲烷的同系物

D.若丁为四原子分子.则丁一定能使品红溶液褪色

考点:中学化学(高级)第二章高中化学学科专业知识第二章高中化学学科专业知识题库
题型:单项选择题

以下为某企业6季度的采购量,根据表9—2试求1~3题。
表9-2某企业6季度的采购量

季 度 1 2 3 4
2008年(台) 1200 700 900 1200
2009年(台) 1400 1000

假设2009年第二季度的预测量为800,平滑系数a=0.8,使用指数平滑法求出2009年第三季度的预测量为( )台。

A.1060

B.860

C.960

D.920

题型:单项选择题

阅读理解。

                                                                 Pacing and Pausing

     Sara tried to befriend her old friend Steve's new wife, but Betty never seemed to have anything to say.

While Sara felt Betty didn't hold up her end of the conversation, Betty complained to Steve that Sara never

gave her a chance to talk. The problem had to do with expectations about pacing and pausing.

     Conversation is a turn-taking game. When our habits are similar, there's no problem. But if our habits

are different, you may start to talk before I'm finished or fail to take your turn when I'm finished. That's

what was happening with Betty and Sara.

     It may not be coincidental that Betty, who expected relatively longer pauses between turns, is British,

and Sara, who expected relatively shorter pauses, is American. Betty often felt interrupted by Sara. But

Betty herself became an interrupter and found herself doing most of the talking when she met a visitor

from Finland. And Sara had a hard time cutting in on some speakers from Latin America or Israel.

     The general phenomenon, then, is that the small conversation techniques, like pacing and pausing, lead

people to draw conclusions not about conversational style but about personality and abilities. These habitual

differences are often the basis for dangerous stereotyping (思维定式). And these social phenomena can

have very personal consequences. For example, a woman from the southwestern part of the US went to live

in an eastern city to take up a job in personnel. When the Personnel Department got together for meetings,

she kept searching for the right time to break in-and never found it. Although back home she was considered

outgoing and confident, in Washington she was viewed as shy and retiring. When she was evaluated at the

end of the year, she was told to take a training course because of her inability to speak up.

     That's why slight differences in conversational style-tiny little things like microseconds of pause-can have

a great effect on one's life. The result in this case was a judgment of psychological problems-even in the mind

of the woman herself, who really wondered what was wrong with her and registered for assertiveness

training.

1. What did Sara think of Betty when talking with her? [ ]

A. Betty was talkative.

B. Betty was an interrupter.

C. Betty did not take her turn.

D. Betty paid no attention to Sara.

2. According to the passage, who are likely to expect the shortest pauses between turns? [ ]

A. Americans.

B. Israelis.

C. The British.

D. The Finns.

3. We can learn from the passage that _____. [ ]

A. communication breakdown results from short pauses and fast pacing

B. women are unfavorably stereotyped in eastern cities of the US

C. one's inability to speak up is culturally determined sometimes

D. one should receive training to build up one's confidence

4. The underlined word"assertiveness" in the last paragraph probably means _____. [ ]

A. being willing to speak one's mind

B. being able to increase one's power

C. being ready to make one's own judgment

D. being quick to express one's ideas confidently

题型:单项选择题

修炉用耐火材料的种类、用途和主要性质是什么?

题型:单项选择题

据2007年统计,我国的高等院校大约有多少所?()

A.1000

B.3000

C.2000

D.4000

题型:单项选择题

“由于缺少必要的创造力和精力,在实施剧增和扩充的战略中一般不会起多大作用,但在其它战略的实施中或多或少地发挥一定作用”的总经理属于下列哪种类型()?

A.交际型

B.开拓型

C.冷静型

D.行政性

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