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【单选题】
下列关于实验现象的描述正确的是 选项 实验操作 实验现象A.
将CH 4 与Cl 2 的集气瓶放在光亮处一段时间 气体颜色变浅，瓶内壁附有油状物
B.
将乙烯在空气中点燃 火焰呈蓝色并伴有黑烟
C.
有苯的试管中加入几滴酸性KMnO 4 溶液，充分振荡 液体分层，溶液紫色褪去
D.
将蔗糖溶液与稀硫酸混合水浴加热，取反应后的溶液少量，加入几滴新制的Cu(OH) 2 悬浊液加热 出现砖红色沉淀
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【单选题】异或门的符号是在矩形里画上（）符号。