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以二异丙胺 ( DIPA ) 、硫酸二乙酯 ( Et2SO4 ) 为原料合成N, N二异丙基乙基胺 ( DIPEA ).N, N - Diisopropylethylamine ( DIPEA ) was prepared from diisopropylamine ( DIPA ) and diethyl sulfate ( Et _ 2 SO _ 4 ).论述了高效液相色谱法测定马来酸二乙酯含量的方法.RP - HPLC absol...
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n.商品，货物vt.买卖，销售vi.经商...
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“刺骨”的拼音为：cì gǔ...
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Liza的音标：...
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养育孩子的现实经常与浪漫的理想大相径庭。The reality of mothering is frequently very different from the romantic ideal.如果你孩子的体温上升，就用海绵蘸上温水轻轻地擦拭她的身体。If your child's temperature rises, sponge her down gently with tepid water.被宠坏的孩子很难得到其他孩...
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n.[印，纺]长丝，单纤维，[电]灯丝，丝极，游丝，细丝，丝状体，[植]（雄蕊的）花丝...
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His appearance belies him.他的外貌给人以假象.The modesty of their home belies their great wealth.他们简朴的家使人们看不出他们拥有巨额财富.She has a trim figure that belies her fifrty - eight years.她身材苗条,看不出已是五十八岁了....
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套瓶帽机...
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yards的音标：yards的英式发音音标为：[jɑ:dz]yards的美式发音音标为：[jɑdz]...
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cablegram的音标：cablegram的英式发音音标为：['keɪblgræm]cablegram的美式发音音标为：['keɪbəlˌgræm]...
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acantha的音标：acantha的英式发音音标为：[ə'kænθə]acantha的美式发音音标为：[ə'kænθə]...
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“联锁器”的英语可以翻译为：interlocker，interlock ...
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Treeless regions found in and around the Arctic, tundras are among Earth's coldest, harshest biomes.无树地区位于北极圈内及其附近,苔原分布在地球最冷, 最荒芜的生物群落之中.This could have been one of the coldest golf tournaments on record.这很可能是高尔夫锦标赛...