自给正压式空气呼吸器背戴装具的佩戴方法是将气瓶阀向下背上气瓶，通过拉肩带上的自由端调气瓶的上下位置和松紧，直到感觉舒适为止.
参考答案：对
完成对话.
A : You look __1__
B: Yes. I am. I had a __2__ busy weekend.
A: Did you play __3__ games?
B: Yes, I __4__ . On Sunday morning, I __5__ soccer on my computer. Then I watched a volleyball
match.
A: Where did you __6__ it?
B: __7__ TV.
A: Great. And what did you do on Sunday night?
B: I __8__ to music at midnight.
A: It __9__ fun.
B: Yes, but a _10__ tired.
前馈控制适用于什么场合？
