石头压在芽的上面 » Stone above the pressure in the bud 编制原理和方法 » Principle and method of preparation 飞秋又掉线了 » Fall and dropped a fly ..
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The principle and method of preparation of mixture gas by pressure measure method are mainly presented, and the control method of various errors in preparation is analyzed.
主要介绍了测压法配制混合气的原理、方法，并分析了配制过程中各项误差的控制。
The design principle of this aperture elongation method, and preparation and standardization of samples are introduced.
介绍了设计孔径伸长率法的基本原理和其试样的制备及标准化。
The preparation principle and method of pumping concrete are introduced, the technology measure to prevent and solve the accident are put forward.
文章介绍了泵送混凝土的配制原则和操作方法，提出了防止和解决发生事故的技术措施。
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