Phosphine (PH3) is an important electronic specific gas which is mainly used in fields of N-type semiconductor doping, ion implement and chemical vapor deposition (CVD) etc.
磷化氢(PH3)是一种重要的电子特气，主要用于n型半导体的掺杂、离子注入和化学气相沉积(CVD)等。
But PLLs design process involves much theory and application base, such as signal and system, integrated electronics, layout, semiconductor technology, measurement etc.
但是锁相环的设计过程，涉及到信号与系统、集成电子学、版图、半导体工艺和测试等方面，难度比较大。
Which use MQ-2 combustible gas sensor-type semiconductor sensors to achieve smoke smoke detection, high sensitivity, fast response, strong anti-interference, etc, and the price low, long service life.
其中选用MQ-2型半导体可燃气体敏感元件烟雾传感器实现烟雾的检测，具有灵敏度高、响应快、抗干扰能力强等优点，而且价格低廉，使用寿命长。
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