单项选择题
A.0.3~0.8cmB.0.8~1.2cmC.1.3~1.8cmD.1.9~2.4cm
A.乔灌搭配B.内乔外灌C.乔灌混交D.只栽灌木
A.4mB.5mC.6mD.7m
A.灌木B.花草C.乔木D.阔叶林
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