单项选择题
A.20%~25% B.15%~20% C.35%~40% D.25%~35%
A.100天 B.120-130天 C.170-230天 D.250天
A.100kg~110kg B.112kg~225kg C.250kg~300kg D.280kg~320kg
A.21~22℃ B.30~35℃ C.30~32℃ D.32~34℃
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