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【单选题】
下列实验中指定使用的仪器必须预先干燥的是   (　　)。 ①中和热测定实验所用的小烧杯 ②中和滴定实验所用的锥形瓶 ③配制一定物质的量浓度溶液的实验所用的容量瓶 ④喷泉实验用于收集NH 3 的烧瓶
A.
①②
B.
①④
C.
②③
D.
③④
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