Such as pentafluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and isobutane; R22 replacement; no equipment changes required; reduced ozone depletiondoi:US20080272330 A1Disclosed is a nonflammable refrigerant composition consisting of pentafluoroethane in an amount from 62% to 67%...
Students in the Han Dynasty usually used as their "schoolbags" . A. bamboo boxes B. cloth bags C. wheeled bags D. backpacks Kids used budai as schoolbags because they were than before. A. heavier B. smaller C. lighter D. bigger What does the underline phrase green military...
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搜索智能精选 题目 Language belongs to each member of the society, to the cleaner ___ to the professor. [A] as far as[B] the same as[C] as much as[D] as long as 答案 C
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—I read a lot,and the works of Lu Xun had a strong on me as a child.( ) A. difference B. attention C. situation D. influence答案difference不同;attention注意;situation情况;influence影响。根据句意可知,写作好的原因是鲁迅的作品对我小时候的"影响"很大。故选:D。
It c【小题2】 the north of China with Hangzhou, a city in the southern part of the country. It’s the l【小题3】 man-made waterway in the world. The Grand Canal was b【小题4】 as a way to transport grain(运输粮食)from the rich agricultural(农业的)land ...
搜索智能精选 题目69、关于社会分工的产生,下列表述中正确的是( )A.社会分工是私有制的产物B.社会分工是商品经济的产物C.社会分工是资本主义的产物D.社会分工是生产力发展的产物 答案【答案】 D