醛固酮的作用是
A.保钾排钠
B.调节钙磷代谢
C.调节酸碱平衡
D.保钠排钾
E.以上均不对
参考答案:D
There is a wooden bridge ______the river _______ my house.
A.above, in front of
B.over, in the front of
C.above, in the front of
D.over, in front of
近视眼表现为
A.视近不清B.视远不清C.圆锥角膜D.眼位易发生内斜E.无立体视觉