用配方法解关于x的一元二次方程x2-2x-3=0，配方后的方程可以是（ ） A．

把下列句子中的间接引语改为直接引语。

1. The doctor asked him how he felt. 

    ________________________________________________

2. He asked me whether I studied English or French. 

    ________________________________________________

3. He asked me how long it would take to go there by plane. 

    ________________________________________________

4. I asked her why she hadn't told me earlier. 

    ________________________________________________

5. He asked me if she was coming.

    ________________________________________________

6. He asked me whether I had any difficulty. 

    ________________________________________________

7. The doctor advised her not to eat too much fat. 

    ________________________________________________

可靠性、（）和（）是衡量计算机系统可靠性的性能指标。

炭化室的焦机侧宽度差叫锥度。

单排脚手架的横向水平杆的一端用直角扣件固定在纵向水平杆上，另一端应插入墙内，其插入长度不应小于l80mm。（）

确立正确的人生观是职业道德修养的前提。