有关烧伤全身感染的防治，以下哪项是错误的（） A.正确处理创面 B.应多次创面细

颗粒中或压抷中于外界相通的空隙称为（），当烧结体中孔隙度小于（），保留的空隙主要是（）。

词汇运用：

1. There is less air ___________ (污染) in the country than in the city.

2. I was ____________ (惊讶) to meet my favourite star in the street.

3. Where is the ___________ (出口) to the new supermarket?

4. This sofa is very ___________ (舒适的) to sit on.

5. I can see many ___________ (顾客) in my cousin's shop on Sunday.

6. Mary is very happy because today is her _________ (twelve) birthday.

7. The children can't wait __________ (open) the presents.

8. The students usually walk out of the classroom _________ (quick) after class.

9. The girl is looking forward to _________ (buy) that new dress.

10. We would like everybody __________ (have) a good time there.

抛掷前，如有可能应先探明坍塌范围，并先将坍塌陡峻的堤岸（）削成坡形。

A、前缘

B、后缘

C、下缘

D、上缘

药疹初次发病的潜伏期一般为（）

A.1~5天

B.4~20天

C.3~7天

D.7~8天

E.4~10天

电流的热效应、化学效应和机械效应对人体造成伤害，使人体表面留下伤痕，包括电烧伤、电烙印、皮肤金属化、机械损伤、电光眼等，电流对人体的这种伤害叫做( )。

A．电击

B．电伤

C．触电

D．过电