单项选择题
A.40% B.50% C.80% D.100%
A.95% B.80% C.70% D.60%
A.5-7天 B.8-10天 C.10-12天 D.15天
A.10-15℃ B.15-20℃ C.25-30℃ D.40-45℃
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