外国人在青就业，办理了就业证后，无论其持何种签证，公安部门应为其签发外国人居留许可。

在实数范围内分解因式：x²+2x-1=______．

Rosa regretted giving her opinion about the decision directly, feeling ________ she should have expressed it differently.

A．how

B．why

C．that

D．if

离合器在紧急制动时，可防止传动系过载。

取得教师资格的条件有哪些？