单项选择题
A.0.7m B.0.5m C.0.4m D.0.2m
A.10m B.8m C.6m D.5m
A.25%~30% B.30%~40% C.40%~50% D.50%~60%
A.18~28℃ B.16~26℃ C.18~25℃ D.21~25℃
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