有一风力发电机，风叶受风面积为s，设通过受风面积s上风的动能转化为电能的效率为η

小儿面色为病理状态的是（）

A.新生儿面色嫩红

B.两颧艳红

C.面色黄而鲜明

D.面色白里透红

E.面色青白相间

磷主要的排泄途径为()

A．肝脏

B．肾脏

C．呼吸道

D．皮肤

E．消化道

关于产褥期，哪项是错误的（）

A.一般规定为6周

B.指产妇全身各器官恢复或接近至正常未孕状态所需要的一段时间

C.子宫复旧主要表现为宫体肌纤维缩复和宫内膜再生

D.产后1周子宫缩至孕12周大小

E.初产妇宫颈外口由产前圆形变为产后"一"字形

What can be concluded from the passage

A．Medical tests and education for Americans with diabetes are not covered by the present healthcare schemes.

B．If you are 20 years old or more, you are more likely to suffer from diabetes.

C．Family help is the more important and most effective in detecting and treating diabetes.

D．In the US, July 1 is a day of celebration for hospital staff, nurses and patients.

对流传热时，除了流体的导热作用外，还有流体流动所引起的热量传递。