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关于牙髓失活法操作错误的是
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A3型题男，4岁。一向偏食，不吃鱼肉蛋，仅食蔬菜，近日发现面色渐苍白，不愿活动，时而腹泻，查体心肺正常，肝脏于肋下触及3cm，脾未及，血Hb60g/L，RBC2.90×1012/L，血涂片：红细胞大小不等，以小为主，中心淡染区扩大。 该患儿最可能诊断是（）
A3型题早产儿，现9个月，单纯牛奶喂养，3个月来肤色苍白，食欲减退。体检：皮肤黏膜苍白，心前区2/6级收缩期吹风样杂音。肝肋下3cm，脾肋下1cm。红细胞2.0×1012/L，血红蛋白50g/L。外周血涂片示红细胞形态大小不均，以小细胞为主，中央浅染。 最可能的诊断是（）
A3型题1岁女孩，面色苍白3个月，体查：口唇粘膜及甲床苍白，心肺未见异常。外周血Hb66g/L，诊断为营养性缺铁性贫血。 首选药物是（）
Mx Black was young and able. He worked very hard. And the boss liked him. Last month he was sent to China on business. When he got to Beijing, he visited some places of interest and felt very happy. One morning before he left for London, he decided to buy something for Tony, the son of his boss. At first he didn’t know what to buy for the boy. Suddenly he remembered that the boy liked birds very much, so he went to the bird market. He was glad to find that there were so many kinds of birds there. He bought four beautiful birds, then he told the boy about it on the telephone. As soon as Mr Black returned to London by air, he went to Tony with the four birds. But on his way to the boss’s home, one of them, flew out of the cage(笼子) and there were only three birds left in it, Then Mr Black bought a local(当地的) bird to take the place of the missing Chinese one. Tony of course was very happy when he saw the birds. But soon he found one of them was different from the other three. He asked, "It’s a local bird, isn’t it, Mr Black" "Yes, it is. " Mr Black answered, "It’s an interpreter(翻译).\ Mr Black returned to London ______.
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