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单项选择题
A.200/500×100/100=40%
B.300/500×100/100=60%
C.50/500×100/100=10%
D.450/500×100/100=90%
E.100/500×100/100=20%
单项选择题
A.50/450×100/100=11.11%
B.200/450×100/100=44.44%
C.450/500×100/100=90%
D.400/550×100/100=81.82%
E.450/650×100/100=53.85%
单项选择题
A.300/350×100/100=85.71%
B.200/450×100/100=44.44%
C.450/500×100/100=90%
D.200/500×100/100=40%
E.300/500×100/100=60%