某疏浚企业中标承担某港口陆域吹填工程，吹填工程量为750万m3，土质为粉细砂，天然密

用括号中单词的适当形式填空。

1. Please be quick, or you       (be)late for the meeting.

2. The bus       (leave)when I got to the bus stop.

3. The dictionary must       (take)good care of.    

4. Either you or she        ( have) made a wrong decision.

5. Joanna received many        (gift) when graduating from middle school.

6. Alex is        (fourth) years old and is taken good care of in the kindergarten.

7. Whose school uniform is that on the chair, yours or       (his)?  

8. It was       (difficulty) for human beings to protect weather in the past.  

9. There is a beautiful       (paint)on the wall in each room of my house.  

10. You need to explain your opinions quite        (clear) when having a debate.

谁负责实验室生物安全管理体系的管理评审，评审的内容包括那些方面？

公安工作的对象决定了公安工作具有打击与保护的双重特点。 ( )

下列因素会降低绝缘材料的性能或导致被破坏（）。

A.腐蚀性气体

B.蒸汽

C.潮湿

D.机械损伤

E.高温

衡量铁矿石的质量的主要指标是（）.