男性22岁,面部及两手掌Ⅱ度烧伤,其烧伤面积约为()。
A.3%
B.4%
C.5%
D.6%
E.7%
参考答案:C
No one ______ in the library. It's very quiet.[ ]
A. talks
B. lies
C. sleeps
加热器由()冷却段、()段和()冷却段三个传热段组成。