教师道德规范是指导教师道德生活的最高准则，在师德规范体系中居于主导和核心地位。
参考答案：错
卫生经济学评价有哪几种评价方法？
Now Helen works _______than before. [ ]
A. more carefully
B. more careful
C. much careful
D. much carefully
an before. [ ]