肾脏中调节血压的物质是（）
A.醛固酮
B.促红细胞生成素
C.肾素
D.谷氨酰胺酶
E.碳酸酐酶
参考答案：C
The plan was so shallow and impractical that no serious _______ was ever made to realize it.
A．recognition
B．comment
C．attempt
D．credit
旋风除尘器的除尘原理是什么？
