用convince / persuade 完成句子。

1. He____the difficulty of the work.

    他使我确信这件工作的艰巨性.

2. I try to____get rid of the danger at once.

    我试图说服他立刻摆脱危险.

3. He tried to________they travel by airplane is quite safe.

    他尽力使他们相信乘飞机旅行是安全的.

4. He________it's no use trying to convince them.

    他坚信试图说服他们是没有用的.

5. You are a teacher of him, so you'd better____ quit smoking.

    你是他老师,你应该劝说他放弃吸烟.

当采用淋水装置（穿孔管或莲蓬头）时，其主要参数值如何确定？