大家帮忙看下这句的大致意思？ the solution is cooled in an efficient freezing mixture to 5°, and a cold solution of 107 g. (1.47 moles) of 95 per cent sodium nitrite in 150 cc. of water is added dropwise with vigorous stirring at such a rate that the temperature remains between 5° and 7°. with efficient cooling about one-half hour is required to add the nitrite. the mixture is stirred for one-half hour longer and then allowed to stand for four hours, during which time it warms up to room temperature. 溶液在一种有效的冷冻混合物中被冷却至5度，然后再向其中滴加150毫升、含95%亚硝酸钠（107g，1.47摩尔mol）的冷的水溶液，滴加的同时高速搅拌，使其溶液温度保持在5～7度。在有效的冷却条件下，硝酸钠的滴加过程约需半个小时。混合物再持续搅拌半个小时后可静置4小时，在此期间（4小时）升至室温。 注：此文中出现一个"one-half hour"，我开始也以为是一个半小时，后经多方查证后确认应译为半个小时。查看更多
第1天
关注盖德视界
添加小助手
