主页
学科
搜索
账户
常见问题
当前学科：遗传性疾病
题目：
单选
男孩，3岁，因生后5个月逐渐出现智力低下，毛发颜色变浅，皮肤白皙且抽风3次来就诊。本病可能的病因是（）
A . 酪氨酸羟化酶缺乏
B . 苯丙氨酸羟化酶缺乏
C . 二氨蝶啶还原酶缺乏
D . 肝磷酸化酶缺乏
E . 碘化酶缺乏
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
关于急性肺炎的描述，错误的是（）
分色误差的原因有哪些？
S4000型UPS当液晶显示“逆变器故障”时，可能原因是旁路故障。
I10设备拔码开关为（）位。
Once we learn the rules for map reading, they seem so simple: up is north, blue is water, a star stands for a capital. But when and how do we learn to read a map? Research shows that even three-year-olds can master, at least in a basic way, the key map-reading concept(概念): a map is a two-dimensional symbol(二维的符号)for three-dimensional space. Linda Acredolo of the University of California, showed a child a map of a room pointed out on it where a toy was hidden and asked the child to find that toy. Depending on the maps orientation(方位), about half the three-year-olds could successfully do so. Three years may be the age at which the ideas become fully understood. Judy Deloache of the University of Illinois let children watch her hide a small toy in a scale model of a room and asked them to find a large one in a real room. "A three-year-olds can do it, but a two-year-olds has no idea that the model has to do with anything larger, " she says. But even if the basic concept is there early, Lynn Liben and Roger Downs of Pennsylvania State University found that children still have a lot to learn. Second graders believe that north is always at the top of a map because of the hanging maps they have seen. "If you asked them to close their eyes and point in the direction of north, often theyll point straight up," says Lihen. She says that children get map-reading skills gradually, and teachers must begin by using maps of familiar areas: their own classrooms, homes, and neighbourhoods.The first two experiments show that______.A．children have better understanding than grown-upsB．children have special natural ability for map readingC．children are more interested in toys than in mapsD．children can start to learn map-reading early
DNA的复制方式是（）。
食管异物的诊断下列哪项最重要（）
对中药饮片的分装进行规范操作的是（）
为确保会计档案管理系统（ADMS）的安全，用户在初次登录后需修改密码（“数字＋字母”组合），不能使用初始密码，并要求定期变更，每月至少更换（ ）次。
锚喷支护