在管道上进行堵盲板停煤气作业后，处理煤气的时间只与风机风量和管道直径有关。

句型转换。

1. She has fun playing soccer there.(改为一般疑问句)

    _____ she _____  fun playing soccer there?

2. Do you often take a boat to work? (改为同义句)

    Do you often _____ to work_____ _____?

3. Mary has a brother and a sister. (改为否定句)

   Mary_____ _____ a brother _____a sister.

4. I spend twenty minutes getting to school.(改为同义句)

    It_____  _____twenty minutes _____ _____to school.

5.Sally never goes to the market by bike.(改为同义句)

    Sally never _____ _____ _____ _____  the market.

6. It takes mc half an hour to read English.(就画线部分提问)

    _____ _____ _____you to read English?

7.  He goes to school on foot.(改为同义句)

     He_____  _____ school.