问题
单项选择题 A1型题
苯甲酸防腐效果最好时的pH值是（）
A.3
B.5
C.7
D.9
E.11
答案
参考答案：A
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苯甲酸防腐效果最好时的pH值是（）
A.3
B.5
C.7
D.9
E.11
参考答案：A
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| In one way of thinking, failure is part of life. In 1 way, failure may be a way towards success. The "Spider-story" is often 2 .Robert Bruce , leader of the Scots(苏格兰) in the 13 th century, was hiding in a cave（洞穴）from the English. He watched a spider 3 a web. The spider tried to reach across a rough(粗糙的) 4 in the rock. He tried six times. On the 5 time he made it and went on to make his web. Bruce is said to have been encouraged by this and to have gone on to 7 the English . Edison , the inventor of the light bulb, made 6 models that failed before he found the right way to make one. Once he was asked 8 he kept on trying to make a new type of battery when he had failed so often, he replied, “Failure? I have 10 failure. Now I know 50,000 ways it won't 9 The important thing to keep in mind about failure is that it's a part of life. Learn to "live with yourself" even though you may have failed． | ||||
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