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【单选题】
在探究氨水成分的实验中,下列根据实验现象得出的结论不正确的是 A .氨水有刺激性气味,说明氨水中含有氨分子。 B .向氨水中滴加酚酞试剂,溶液变红,说明氨水中含有OH - C .向氨水中加入浓氢氧化钠溶液,加热产生使湿润的红色石蕊试纸变蓝的气体,说明氨水中含有NH 4 + D .浓氨水和浓盐酸靠近产生大量白烟,说明氨气与氯化氢容易反应。
A.
B.
C.
D.
D
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【单选题】以下哪些不是网上市场调研的主要内容（　）
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【简答题】一对直齿圆柱齿轮的正确啮合条件为：（）与（）。A. m 1 = m 2 α1= α2
查看完整题目与答案