题目请看图片
考试:=$ecms_gr[fenlei]?>
科目:=$ecms_gr[kemu]?>(在线考试)
问题:
A:将轮C与轮D对调
B:将轮B与轮D对调
C:将轮B与轮C对调
D:将轮B与轮D对调,然后再将轮B与轮B对调
答案:
解析:
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