一定条件下，下列物质在密闭容器内充分反应，测得反应前后各物质的质量如下：则反应后A的

复数z=x+yi(x,y∈R)满足|z－1|=x,则复数z对应的点Z(x, y)的轨迹方程为__________.

句型转换。

1. Call him back! (改写为否定句)                

    ________ ________ him back!

2. There will be more roads in our town.(改写为一般疑问句)

    _____   _ there ____    __ more roads in your town?

3. They must not sweep the floors today.(对划线部分提问)    

    _______ ________ they sweep the floors?

4. Going to bed early and getting up early will keep you active in the daytime.(改为同义句)

    Going to bed early and getting up early will keep you active ________ the ________.

5. 我们的英语老师擅长讲笑话.(完成译句)

    Our English teacher    ___ well ____   _ telling jokes.

抄表人员不得同时从事收费工作。

矿石还原度（）划为原生矿或磁铁矿。

A、<2.7

B、>3.5

C、>2.7

D、2.7-3.5

生态对策