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【单选题】
下列哪一类土的开挖必须要采用爆破方法( )。A.
软土
B.
普通土
C.
D.
坚石
拍照语音搜题，微信中搜索"皮皮学"使用
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B.
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C.
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D.
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E.
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F.
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G.
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【简答题】写出下图所示电路的逻辑表达式。
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