单项选择题
A.±16.2 B.±18 C.±17 D.±20
A.7.5 B.12 C.10 D.8.5
A.2.105 B.1.985 C.2.335 D.0.988
A.6-18.1 B.5-15.5 C.4-13.5 D.4-15.8
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