弹簧管压力表中的调整螺钉的作用？
参考答案：
改变调整螺钉的位置，用以改变扇形齿轮短臂的长度，达到改变传动比的目的。
根据句意及首字母提示完成下列句子。
1. My parents grow rice and vegetables on the f _____ .
2. It's too cold. Let's l _____ a fire to keep warm.
3. My grandfather used to collect water from the w _____.
4. The famous musician was unable to a _____ because of an accident.
5. The desk is made of w _____. It's very strong.
电路的阻抗为电阻、感抗、容抗三者的代数和。
