预设

阅读理解。

     Which is the biggest  country  in  the world? Well, look at the map and you'll know it is Russia. It is

followed by  Canada,  China,  the U.S.A.  and Brazil. Among them, China has  the  largest  number  of

people, with a population(人口) of about 1.3 billion(十亿). Canada has the longest  coastline(海岸线).

The total length(长度) of the coastline is about 202,080 kilometers.  It is long enough to go around  the

earth six times.

     Do you know which is the largest island(岛) in the world? Is that Hawaii? No, it is much smaller than

the largest island in the world-Greenland. Greenland  is to the northeast(东北)  of  Canada.  Ice  covers

81% of its land. It is very cold there, so there are only about 56,000 people living on the island.

根据短文内容,判断下列句子正(T)误(F).

(     )1.Russia is the largest country in the world.

(     )2.The country with the largest population is China.

(     )3.The total length of Canada's coastline is about 202,080 kilometers.

( )4.The largest island in the world is Hawaii.

( )5.The population of Greenland is about 56,000.

写出能实现下列反应的化学方程式各一个。

(1)SO₄^2-+Ba²⁺=BaSO₄↓：______________

(2)CO₂+2OH^-=CO₃^2-+H₂O：______________

(3)HCO₃^-+H⁺=H₂O+CO₂↑：______________

《城市排水工程规划规范》规定，城市排水工程规划的主要内容不应包括( )。

A．进行排水系统布局

B．划定城市排水范围

C．确定排水枢纽工程的位置、建设规模和用地

D．提出水资源保护以及开源节流的要求和措施

隔离网闸的三个组成部分是（）

A.漏洞扫描单元

B.入侵检测单元

C.内网处理单元

D.外网处理单元

E.专用隔离硬件交换单元

C125M³3-2RH离心机油路溢流阀动作值是（）。

A.正常油压的两倍

B.正常油压的三倍

C.正常油压的一倍

D.正常油压的1.1倍