look up是什么意思,look up和look for的区别?

向上看,与look up同义,后者更常用 。附上look up的用法A.查阅;查找If there are words you don't understand, look them up in the dictionary.如果有不认识的词,就查字典 。注意:“查字典”应为look sth up in the dictionary而不能说look up the dictionary.B.看望Don't forget to look me up when you come to Beijing.到了北京别忘了来看我 。

look up是什么意思,look up和look for的区别?

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【look up是什么意思,look up和look for的区别?】look up和look for的区别?
look up和look for没有区别
石英玻璃采用高纯度的硅砂作为原料,制作的传统方法是熔融-淬灭方法(加热材料到熔化温度,然后快速冷却到玻璃的固态相);制作超高纯度和紫外透射比的透明玻璃需硅的汽化、氧化成二氧化硅并加热溶解等过程 。