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王老师:19139051760(拨打)
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第1题

根据位移－时间曲线判断 ，当d2u/d2t<0时，表明围岩已进入危险状态。 × √
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第2题

According to the text ，Poor Richard is a person who A. A. knows a lot of old sayings B. B. works very hard all his lif
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第3题

简述断层破碎带和富水软岩.
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第4题

The sayings mentioned in the text were witten by. A. A. Franklin himself B. B. Franklin and Poor Richard C. C. one of
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