工程用土按照土的坚实系数分类时,若坚实系数为0.6~0.8,则该类土属于()。
A、一类土,松软土
B、二类土,普通土
C、三类土,坚土
D、四类土,砂砾坚土
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B、失范理论
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B、 67 dBm
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D、 86 dBm
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