苏丹Ⅳ染色可以证明______。

阅读理解。

      In 1998, World Cup Football Match held in France took up a new rule. Instead of the usual black

and white ball, a colorful ball was used in the game.  The new ball was made up of' 32 pieces of three

colors: red, blue and white.  Interesting enough, the French national flag happened to be in three colors,

too. Besides, 32 teams took part in the coming World Cup. But early football was made up of' eight

pieces of leather.  As time went by, more pieces of leather were used, from 12 pieces to 18 to 26 and

then t0 32 now.

     About three million such new footballs were made, And then some players were playing the new ball

in their training.  The makers have warned the goalkeeper that the new ball flies in a direct line at a fast

speed.    

     After trying the ball for some time, a footballer said that the ball was quite different from  the traditional (传统的)  black and white one, and that the goalkeeper would find it harder to catch them. Another

footballer said that there would be more goals. "For the player on the ground, the new ball is easier to

control as it flies. A good player can shoot in more goals," he said.

1.What was the new rule in 1998 WCFM?

2.  What is the color of the national flag of France?

3.  Was the early football made up of eight pieces of' leather?

4. How many teams joined the World Cup Football Match when the new rule was used?

5.  It's hard for the goalkeeper to catch the new ball because                                                    

紫外分光光度法测定操作错误的是（）

A.取吸收池时，手指拿两侧面的毛玻璃。盛装样品溶液以池体积的4/5为宜。透光面要用擦镜纸由上而下擦拭干净

B.由于吸收池和溶剂本身可能有空白吸收，因此测定供试品的吸光度后应减去空白读数，或由仪器自动扣除空白读数后再计算含量

C.供试品溶液的吸光度在0.7～1.0为宜，因为吸光度读数在此范围内误差比较小

D.当溶液的pH对测定结果有影响时，应将供试品溶液和对照品溶液的pH调成一致

E.称量应按药典规定要求。配制稀释溶液时稀释转移次数应尽量少，转移稀释时所取容积一般不少于5ml

甲施工企业获知自己的竞争对手乙施工企业正在与丙施工企业协商联合投标，遂与丙施工企业谈判联合投标事宜，甲施工企业在谈判中故意拖延时间。在乙施工企业放弃与丙施工企业联合投标后，通知丙施工企业将单独投标，根据《中华人民共和国合同法》规定，下列关于甲施工企业上述行为的法律责任的说法中，正确的是（）。

A.无论丙施工企业是否有损失，甲施工企业均应承担违约责任

B.无论丙施工企业是否有损失，甲施工企业均应承担缔约过失责任

C.甲施工企业承担法律责任，以丙施工企业有损失为前提

D.甲施工企业承担法律责任，以乙施工企业有损失为前提

简述麦圆叶爪螨的生活习性。

文件中出现的公式一般应（）书写。