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【单选题】
为研究金属腐蚀的条件和速率，某课外小组学生用金属丝将三根大小相同的铁钉分别固定在图示的三个装置中，再放置于玻璃钟罩里保存一星期后，下列对实验结束时现象描述不正确的是（ ）A.
装置Ⅰ左侧的液面一定会上升
B.
左侧液面装置Ⅰ比装置Ⅱ的低
C.
装置Ⅱ中的铁钉腐蚀最严重
D.
装置Ⅲ中的铁钉几乎没被腐蚀
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A.
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