单项选择题
A.D+2.5d B.D+3d C.(D+3d)±0.5d D.(D+2.5d)±0.5d
A.100 B.103 C.104 D.103.5
A.29.5% B.30.0% C.29.8% D.29.0%
A.2 B.3 C.4 D.6
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