smoke level

This paper has MQ-2 resistance-type smoke sensor and analog electronics technology as the core, to design a good technical level of the smoke alarm.

本论文以MQ-2电阻式烟雾传感器和模拟电子技术为核心，设计出一种技术水平较好的烟雾报警器。

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The surgeon general says there is no safe level of secondhand smoke.

外科医生主任说,二手烟是种不安全因素.

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Methods To investigate the personal name, sex, age, level of education, family history, BMI, smoke, alcoholic drink and excess salt etc from the personnel of 60-year-old in 1145 cases.

方法对入选的60岁以上的1145例农民进行姓名、性别、年龄、职业、文化程度、家族史、体重指数（BMI）、吸烟、饮酒、嗜盐等情况调查。

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There is no risk-free level of exposure to secondhand smoke.

没有风险的二手烟含量是不存在的。

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The result has laid down a foundation for dynamic and static analysis of the governor, as well as for the problems of bigger overload smoke level and bad startability of the engine.

调速器恢复力特性的表达式和特点的分析为调速器动静态分析和X195等单缸柴油机超负荷烟度大，启动性能不良等问题的分析奠定了基础。

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Describes briefly the basic concept about natural smoke exhaust calculation, such as thermal pressure, steady state fire, neutral level, flow coefficient, etc.

简要阐述了自然排烟计算的基本概念，如热压、稳态火灾、中和界、流量系数等；

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