问题
单项选择题
有关快速斑点免疫金渗滤法（Dot-immunogold filtration assay）的描述哪些是正确的（）
A、又称滴金免疫法
B、基本原理仍是间接法或夹心法
C、在操作完成后即可直接观察结果
D、夹心法测抗原的机理为：固定于膜上的多克隆抗体+标本中待测抗原+金标记的特异性单克隆抗体显色
E、以上都正确
答案
参考答案：E
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有关快速斑点免疫金渗滤法（Dot-immunogold filtration assay）的描述哪些是正确的（）
A、又称滴金免疫法
B、基本原理仍是间接法或夹心法
C、在操作完成后即可直接观察结果
D、夹心法测抗原的机理为：固定于膜上的多克隆抗体+标本中待测抗原+金标记的特异性单克隆抗体显色
E、以上都正确
参考答案：E
| 完形填空。 | |||
| But 1 a few of them are very 2 . English is one of these. Many, many people use it, not only in England and the U. S. A, but in other parts of the world. About 200, 000, 000 speak it as their own language. It is difficult to say how many  people are learning it as a 3 language. Many millions are 4 to do so. Is it easy or difficult to learn English? Different people may have different 5 . Have you ever 6 the ads of this kind in the newspapers or magazines? 'Learn English in six month, or your 7 back ...' 'Easy and funny? Our records and tapes 8 you master your English in a month. 9 the first day your 10 will be excellent. Just send ..." Of course, it never 11 quite like this. The only language that seems easy to learn is the mother tongue. We should 12 that we all learned our own language well when we were 13 . If we could learn English in the same way, it would not seem so difficult. 14 what a small child does. He listens to what people say. He tries what he hears. When he is using the language, talking in it, and 15 i  n it all the time, just imagine how much 16 that gets! So it is 17 to say that learning English is easy, because a good command of English 18 upon a lot of practice. And practice needs great effort and 19 much time. Good teachers, records, tapes, books, and dictionaries will 20 . But they cannot do the student's work for him. | |||
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