佝偻病的病机主要是
A.肺脾不足B.心肝两虚C.心肝火旺D.脾肾两虚E.肝肾不足
参考答案:D
阅读对话回答问题。
May: Jim, come here, please.
Jim: What's wrong?
May: My kite is broken.
Jim: Don't worry. Let me help you make a new one.
May: Make a new kite?
Jim: Yes, you're right. I can make a kite.
May: I think it's very hard.
Jim: No, it's easy. And we can do it now and here.
May: Now and here?
Jim: Yes. Do you want a go?
May: Great! Thank you.
1. How is May's kite?
2. Who can help May make a new kite?
3. Is it easy for Jim to make a new kite?
4. Can they make a new kite now and here?
5. Does May want a go?
如图所示,设曲线L的方程为y=f(x),且y">0.又MT,MP分别为该曲线在点M(x0,y0)处的切线和法线.已知线段MP的长度为
(其中y0=y0(x0)),试推导出点P(ξ,η)的坐标表达式.