问题
单项选择题 A1型题
苯甲酸用作液体制剂的防腐剂，防腐的最佳条件是（）
A.pH8以上
B.pH7以下
C.pH4以上
D.pH5以上
E.pH4以下
答案
参考答案：E
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苯甲酸用作液体制剂的防腐剂，防腐的最佳条件是（）
A.pH8以上
B.pH7以下
C.pH4以上
D.pH5以上
E.pH4以下
参考答案：E
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| I like pandas very much. They are very 1 . Most of them live in Sichuan, 2 . They 3 white fur (皮毛), but their shoulders, legs, ears and eyes are 4 . Pandas are usually heavy, but they can climb trees like 5 animals. Pandas like eating bamboo 6 . They also like sleeping. They 7 some hours every day. Sadly, there are 8 pandas in the world today. 9 some people cut down (砍伐) too many bamboo trees. I think we must 10 them. | ||||
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