单项选择题
A.460-560 B.500-600 C.520-630 D.480-580
A.0.5~1 B.1 C.1~1.5 D.1.5~2
A.1100~1200 B.1150~1250 C.1105~1205 D.1115~1125
A.1200±5 B.1050±5 C.1100±5 D.1150±5
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