缺乏维生素B6、B12和叶酸会引起巨幼红细胞性贫血。( )
参考答案：错
解析：缺乏维生素B12和叶酸会引起巨幼红细胞性贫血。
Mr. Blake __________my letter, otherwise he would have replied by now.
A．will not have received
B．needn’t have received
C．shouldn’t have received
D．couldn’t have received
社区护士的基本条件错误的是（）
A、具有国家护士执业资格
B、经过社区护士岗位培训
C、护士学校毕业即可，无需培训
D、从事临床护理工作5年以上
