单项选择题
A.200-230 B.205-235 C.210-240 D.215-245
A.0.5±0.1 B.1.5±0.1 C.0.5±0.2 D.1.5±0.2
A.1/2 B.1/3 C.3/4 D.3/5
A.0.1 B.0.2 C.0.3 D.0.4
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