Design and synthesis of c60 double - aza - bridge derivative 60双氮杂衍生物的合成与结构分析
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4 sets of aza and zb worm grinding wheel gear machine by reishauer in switzerland 瑞士莱斯豪尔aza zb蜗杆砂轮磨机4台。
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This article reviewed the synthesis of n - substituted aza crown ethers and their new applications to the field of selective complexation and extraction for metal ions 摘要综述了n -取代氮杂冠醚的合成和对金属离子的选择性络合和萃取研究的新进展。
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Problems with caring for pachyderms , as well as new standards from the aza , have led five zoos , including those in chicago , san francisco and detroit , to discontinue their elephant exhibits 包括芝加哥动物园旧金山动物园以及底特律动物园在内的5家美国动物园已经决定停止公开将大象关在笼子里展示的做法。
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Problems with caring for pachyderms , as well as new standards from the aza , have led five zoos , including those in chicago , san francisco and detroit , to discontinue their elephant exhibits . about 40 other zoos are expanding their exhibits to meet the standards 由于饲养大象存在许多难以解决的问题以及美国动物园与水族馆联合会在这方面最近出台的新标准，包括芝加哥动物园旧金山动物园以及底特律动物园在内的5家美国动物园已经决定停止公开将大象关在笼子里展示的做法。
