t℃时，氯化钾溶解度为mg，t℃时氯化钾饱和溶液中溶质质量分数为n%，则m与n在数值上的比较是（ ）
A．n＞m
B．m＞n
C．m=n
D．无法比较
t℃时，氯化钾溶解度为mg，即在t℃时，mg氯化钾溶解在100g水里形成饱和溶液100g+mg，根据饱和溶液中溶质质量分数的计算公式：
× 100%=n% 可表示为：mg 100g+mg
=mg 100g+mg
因分数的分子、分母不同，而比值相同，故m＞n．ng 100g
故选B
| 完形填空。 | ||||
| The English language is different from any other language. Yet English words do not 1 the same. It is always 2 . People need new words 3 new inventions and new ideas. Different words come into use or older words are used in a new way. English can change by borrowing words from other languages. The word "tomato" was borrowed from Mexico, the word "coffee" came from Turkey, and "tea" from 4 and so on. Now new space and science words 5 from other countries, too. New words are also made by adding two words 6 . The words "strawberry", "postman" and "blackboard" are made up of two parts. Sometimes new words are 7 forms of old words. The word "photo" was made from "photograph" by cutting off the 8 of the long word. The word "plane" was made by cutting off the 9 part of "airplane". While "smog" was made by using only the first two letters of "smoke" and cutting off the front part of "fog". And products can become new words. Our "sandwich" was named after 10 named Sandwich, and "jelly (果冻)" was a name made up by the company that first made this product. | ||||
|