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![YJ260(T2-30X3)空中6.6m层高花园的覆土厚度是多少()](https://img2.soutiyun.com/shangxueba/askcard/2024-03/8/1264/20240308190923572.jpg)
[单选题]
YJ260(T2-30X3)空中6.6m层高花园的覆土厚度是多少()
A.300 mm
B.400 mm
C.450 mm
D.500 mm
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A.300 mm
B.400 mm
C.450 mm
D.500 mm
第1题
A.YJ140-6 (T2-18X3 )
B.YJ190-2 (T2-31X3 )
C.YJ215 (T2-30X3 )
D.YJ260 (T2-30X3 )
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