问题
单项选择题
血液中最重要的缓冲对是()
A.碳酸氢根与碳酸
B.氯离子与盐酸
C.磷酸二氢根与磷酸
D.蛋白质钠盐与蛋白质
E.以上都不是
答案
参考答案:A
血液中最重要的缓冲对是()
A.碳酸氢根与碳酸
B.氯离子与盐酸
C.磷酸二氢根与磷酸
D.蛋白质钠盐与蛋白质
E.以上都不是
参考答案:A
从以下方框中选出适当的句子,完成对话。 | |
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Jack: We are going to my teacher’s house for dinner tomorrow. 1 Lucy: 2 We can bring some candies(糖果) or toys for the kids. Jack: But I’m not sure whether they’d like them. Lucy: 3 I usually bring flowers when it’s hard to choose a suitable(适合的) present. Jack: 4 I may also buy a small vase(花瓶). Lucy: Great! Jack: Will you go to choose(选择) some flowers with me? Lucy: 5 |