A.a =" b," b =" a" | B.a =" c," b =" a," c =" b" |
C.a =" c," b =" a," c =" a" | D.c =" a," a =" b," b = c |
科目:高中数学 来源:不详 题型:单选题
A.6 | B.120 | C.720 | D.1080 |
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