单项选择题
A.低于1800 B.1800～3200 C.在于3200 D.大于4200
A.30~40% B.20~30% C.50~60% D.70~80%
A.12~14 B.14.2~41.0 C.41.0~52 D.52~72
A.<1.17 B.<2.17 C.<3 D.<3.5
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