单项选择题
A.500 B.1000 C.2500 D.5000
A.1/1000 B.1/900 C.1/800 D.1/750
A.0.19、0.66 B.0.17、0.69 C.0.17、0.66 D.0.19、0.69
A.0.41 B.0.42 C.0.43 D.0.44
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