百分吸收系数的含义是指
A．在一定波长下，溶液浓度为1%(v/，厚度为lcm时的吸收度
B．在一定波长下，溶液浓度为1%(w/，厚度为1cm时的吸收度
C．在一定波长下，溶液浓度为1%(w/，厚度为lcm时的吸收度
D．在一定波长下，溶液浓度为1%(v/，厚度为lcm时的吸收度
E．在一定波长下，溶液浓度为1g/ml，厚度为1cm时的吸收度
参考答案：B
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| Radio, telephone and television are widely used in the world. When you 1 the radio, you can listen. But when you use telephone, not only can you listen to others 2 you can chat with them, however, you can't see the other one at all. Television is 3 than both of them. People can watch TV and listen to it, 4 you can't take part in what you see. Today, some people are using a type of telephone 5 vision-phone. Two persons who are talking can see each other 6 it. Vision-phones can be of great use when you have something 7 the person whom you are calling. It may also have other uses in the future. Some day you may be able to call up a 8 and ask to read a book right over your vision-phone. You may be able to do the shopping through it, too. Perhaps 9 the near future, vision-phone will come into wider uses in our 10 life. | ||||
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