对形成恒沸物的某体系,下列说法不正确的是()。 A.当压力确定后,其恒沸温度和恒沸组

题型:单项选择题

问题:

对形成恒沸物的某体系,下列说法不正确的是()。

A.当压力确定后,其恒沸温度和恒沸组成确定

B.二元恒沸物的压力确定后,则恒沸温度和恒沸组成确定,而三元恒沸物则不然

C.除恒沸点外,在其余组成下,精馏仍具有分离作用

D.体系在恒沸点的自由度数目与恒沸物的组分数无关

考点:化学分离工程分离工程基础知识分离工程基础知识题库
题型:单项选择题

高液相色谱仪中的检测器主要为()。

A、紫外吸收检测器

B、红外检测器

C、差示折光检测

D、电导检测器

题型:单项选择题

劳动纠纷,是指劳动者与用人单位之间因执行劳动法律、法规或履行劳动合同、集体合同发生的争执。
根据上述定义,下列行为属于劳动纠纷的是( )。

A.因为不满装修质量,房主与装修工人发生纠纷

B.两家生产同种产品的企业因为工资存在差别而发生纠纷

C.工人因反对不发放加班工资而与用人单位发生的争执

D.工人因不满经理的领导方式而与之发生争执

题型:单项选择题

阅读理解

     How words came into being is unknown. All we assume(推测)is that some early men invented

certain sounds, in one way or another, to express thoughts and feelings, actions and things, so that

they could talk with each other. Later they agreed upon certain signs, called letters, which could be

put together to show those sounds, and which could be written down. Those sounds, whether spoken

or written in letters, are called words.

     The power of words, then, lies in their associations - the things they bring up to our minds. Words

become filled with meaning for us by experience; and the longer we tire, the more certain words bring

back to us the happy and sad events of our past; and the more we read and learn, the more the number

of words that mean something to us increases.

     Great writers are those who not only have great thoughts but also express these thoughts in words

which have powerful effects on our minds and feelings. This clever use of words is what  we call literary

style(文体). Above all, the real poet is a master of words. He can express his  meaning in words which

sing like music, and which by their position and association can move men to tears, We should therefore

learn to choose our words carefully and use them correctly, or they will make our speech silly and

common.

1. We learn from the text that language might have begun with         .

A. expressions      

B. sounds      

C. signs        

D. actions

2.What is mainly discussed in Paragraph 2?

A. The relation of human experience with words.    

B. The importance of old words

C. The gradual change and development of words.  

D.The learning of new words.

3. In the last paragraph, what does the author suggest that we should do? 

A.Learn poems by heart.                  

B. Make musical speeches

C. Use words skillfully.                  

D. Associate with listeners.

题型:单项选择题

缺铁性贫血的临床表现少见的是()

A.原发病的临床表现

B.皮肤苍白、活动后气短

C.细胞含铁酶缺乏的表现

D.外胚叶营养障碍的表现

E.视 * * 水肿、脾脏肿大

题型:单项选择题

保育员工作就是只限于扫地、擦桌子、拿饭、维持秩序这样一些工作。

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