Power switch for controlling power supplymeter box-off and normal shutdown operation.
电源开关用于控制仪表箱电源的通断和正常停机操作。
2
Can you supply this quality at approximately 50 cents per meter?
你方可否以每米50美分的价格提供这种质量的产品？
3
The principle and the method of making a special power supply for a small, highly stable potential difference meter are introduced. It finds comprehensive application in college physical experiments.