句型转换。

1. I have many friends here. (同义句)

    I have ________ ________ friends here.

2. They like baseball. (对画线部分提问)

    ________ ________ they like?

3. David likes Chinese books? (对画线部分提问)

    ________ ________ David ________?

使用延期电雷管爆破的工作面，通电以后拒爆时至少等5分钟，才可沿线路检查原因。