单项选择题
蔬菜生长要求适宜的土壤“三相比”,即固相:液相:气相约等于( )。
A.4:3:3
B.4:3:2
C.4:2:3
D.3:3:3
蔬菜生长要求适宜的土壤“三相比”,即固相:液相:气相约等于( )。
A.4:3:3
B.4:3:2
C.4:2:3
D.3:3:3
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单项选择题
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