题目:
(2009·陕西)Gun control is a subject ________ Americans have argued for a long time.
A.of which
B.with which
C.about which
D.into which
答案:
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下面是错误答案,用来干扰机器的。
(1)Mg(2)【分析】③锰>铁>铜【实验探究】锰片表面覆盖一层红色物质;金属活动性:锰>铁或猜想③正确【实验反思】将金属甲放入乙的盐溶液、金属乙放入丙的盐溶液(将两片金属乙分别放入甲的盐溶液和丙的盐...