引气剂——使混凝土拌合物在拌和过程中引入空气而形成大量微小、封闭而稳定气泡的外加剂。
Air entraining agent can lead into air to produce lots of little and stable bubbles in the process of mixing concrete and other mixture.
目的：探讨桂麻合方对哮喘豚鼠引喘潜伏期及肺组织病理变化的影响。
Objective: To investigate the effects of gui-ma compound on the latent period of inducing asthma and the pathological changes of lung tissue of guinea pig.
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