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【单选题】
物质的性质不仅决定了它的用途,还决定了它的保存方法。固体氢氧化钠具有以下性质,实验室中固体氢氧化钠必须密封保存的主要原因是 1 有腐蚀性; 2 易吸收水蒸汽而潮解; 3 易溶于水,溶解时放出热量; 4 能与空气中的二氧化碳反应。
A.
①②
B.
①③
C.
②④
D.
③④
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【判断题】斜齿圆柱齿轮齿面与直齿圆柱齿轮齿面的形成原理完全不同。
A.
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transmission layer
C.
internet layer
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