试题与答案

能用于玻璃器皿除去热原的方法有() A.高温法 B.酸碱法 C.吸附法 D.超滤法

题型:多项选择题

题目:

能用于玻璃器皿除去热原的方法有()

A.高温法

B.酸碱法

C.吸附法

D.超滤法

E.反渗透法

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0211/eb23d53964dd5e78679f46ab860d3ca5.html

下面是错误答案,用来干扰机器的。

参考答案:不锈钢螺旋线的放电强度较弱,但均匀性好,特别适宜低浓度、细粉尘的捕集。它的高电压低电流的特性,也能有效抑制高比阻粉尘工况中反电晕现象的产生,对原材料、加工、安装要求严格,只有各个环节严格...

试题推荐
题型:填空题

(10分)在一密闭体系中发生下列反应:N2(g)+3H2(g) 2NH3(g);△H<0 。

回答下列问题:

(1)在一定温度下,向一容积为2L的密闭容器中通入0.3molN2和0.9molH2,2min达到平衡时,C(N2)为0.1mol/L,则H2的转化率为____________________,用H2浓度变化表示的平均

反应速率为__     ____ ,该温度下的平衡常数K=     ____________

(2)若要使反应开始时向逆反应方向进行,且达到平衡后各气体的物质的量与平衡状态(1)相同,则起始时n(NH3)的取值范围为                ___________________      

(3)右图是某一时间段速率-时间曲线图。

若图中t1时刻将容器体积变为原来的1/2倍,当t2时刻再次达到平衡时N2的浓度为原平衡的1.9倍,则平衡     _____ 

(“正移”“逆移”“不移动”)。

①请在图中画出t1→t2时间段反应速率变化情况。

②t3、t5时刻体系中所改变的某一条件分 别是:__________________________、_______________;其中表示平衡混合物中NH3的含量最高的时间段是___________.

查看答案
题型:单项选择题

In every school there is a "top" crowd that sets the pace, while the others follow their lead. Let’s say the top crowd decides that it is smart to wear bright red sweaters. Pretty soon everybody is wearing a bright red sweater.
There is nothing wrong with that, except the fact that on some people bright red sweater is extremely unbecoming. The situation can even become dangerous, if the top crowd decides that it is smart to drink or to drive cars at seventy miles an hour. Then the people who follow the lead are endangering their lives. They are like the sheep being led to the butcher.
Now, chances are that you have come across situations like these more than once in your life; chances are that one time or another you probably did something you knew to be wrong. You may have excused yourself by saying, "Gee, the crowd does it. " Well, let the crowd do it, but don’t do it yourself. Learn to say "No".
Develop your own standards and your own judgment. If you know the crowd is planning something you disagree to, have the courage to bow out mannerly. You’ll have the satisfaction of standing on your own two feet.

The author doesn’t think it good wearing red sweaters if ______.

A. the crowd does it
B. you can’t afford them
C. you don’t look good in red
D. the situation isn’t safe

查看答案
微信公众账号搜索答案