题干
下列有关命题的说法正确的是 ( )．
A：命题“若，则”的否命题为：“若，则”．
B：“” 是“”的必要不充分条件.
C：命题“若，则![](http://tiku.21cnjy.com/tikupic/ed/68/ed9687c5108eef8c </p>
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<a href="/question/3942341.html">上一题</a> <a href="/question/3942343.html">下一题</a> 0.0难度 选择题 更新时间:2013-07-23 09:57:01
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C
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化学实验里，老师给学生准备了如图几种实验装置<p><img data-cke-saved-src="/Upload/site3/2/a/2a2f83c7b1916073433d19dbafe1f0fe.png" src="/Upload/site3/2/a/2a2f83c7b1916073433d19dbafe1f0fe.png" v:shapes="图片_x0020_3" height="113" width="532"></p>
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<p>- Don)
- Sorry, I__________.
