题目内容

水泥安定性试验时，调整好沸煮箱内的水位，沸煮试件应保证在30min±5min内加热水至沸腾，并恒沸（）。

A. 3ｈ±15min
B. 3ｈ±5min
C. 5ｈ±15min
D. 5ｈ±5min

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关于雷氏法测定水泥安定性描述错误的是（）

A. 净浆装入雷氏夹后应在养护箱内养护24h±2h
B. 试件需要进行沸煮
C. 沸煮时恒沸时间为180min±5min
D. 沸煮时指针向下

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