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。
PA is the world's recognized as a simple, convenient method of detection and diagnosis of HIV infection, the price is also more expensive.
PA是世界上公认的一种简单、方便检测诊断HIV感染的方法，价格也比较昂贵。
Information on new products, new technologies, supply and demand, price, predict and quality detection of agricultural products is hotly requested.
新品种、新技术、供求、价格、预测、农产品质量检测等信息成为需求热点。
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