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本文通过对在综采工作面回收过程中使用爬道的安全性、可靠性、经济性进行评估分析，在加强人员组织和现场管理的条件下，提出了保证回收工作安全高效开展的方法，降低工人劳动强度，取得了良好的经济效益。 相似文献
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麻疯树花药愈伤组织诱导的初步研究 总被引：14，自引：0，他引：14
Preliminary studies were done on the factors affecting the callus inducement from the anther of Jartopa curcas L.,including the development stage of microspores,cold pretreatment,hormone and sucrose concentration.The results showed: compared with other stage,microspores at uninucleate stage were more suitable for culture;the cold pretreatment at 4℃ for 3～5 days is essential to high ratio of inducement;the culture medium that MS+ NAA 2.0mg/L +KT 0.4mg/L +sucrose 9% is comparativelymore suitable for callus in... 相似文献
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