Phenyl ( or polyphenyl ) substituted epoxides serve as excellent precursors to phenyl ( or diphenyl ) carbenes.某些苯代 ( 或多苯 ) 环氧乙烷是制取带苯环 ( 或二苯 ) 碳烯的极好原料.The epoxides were obtained with up to 90 % yields in the reaction sys...
你能用堵缝填补裂缝 吗 .Can you close the cracks with caulking?堵塞材料用于堵缝的通常不渗透的材料.A usually impermeable substance used for caulking.堵缝使用防水''.'材料'.'', 如麻絮或沥青''.'堵漏'. ''缝以使 (...
非 疫源地内未发现抗体阳性者.And the antibodies were not detected in healthy population of non - epidemic area.结论:长白山区是莱姆病重要疫源地,人群中有莱姆病感染存在,并有莱姆病发生.There are infections of Lyme disease among the mountain residents in Changbaishan.高原生物...
It had totem poles, masks, beadwork , basket and prints.里面有图腾柱 、 面具 、 镶缀珠 、 篮筐以及版画.The Indians brought in exquisite beadwork to sell.印第安人带了精美的珠饰来卖。Beadwork: Ornamental work in Beads.珠饰品: 用小珠子制作的装饰物.The Indians brought in...