单项选择题
A.5~15cmB.10~20cmC.20~30cmD.25~35cm
A.1/3~1/2B.1/2C.1/2~2/3D.1/3~2/3
A.春播B.秋播C.冬播D.随采随播
A.5~10cmB.10~15cmC.15~20cmD.20~25cm
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