单项选择题
A.5 B.8 C.10 D.12
A.氮 B.磷 C.钾 D.钙
A.45%—55% B.60%—80% C.85%—90% D.70%—90%
A.85%—90% B.60%—80% C.70%—80% D.65%—85%
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