搜题
王老师:19139051760(拨打)
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第1题

什么是鸭筋和浮筋？浮筋为什么不能作为受剪钢筋？
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第2题

预应力钢筋可分为( )、( )、( ) 三大类
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第3题

If there were fewer cars on the city roads, _______. 选择一项： A. the roads would be more crowded B. the air would be c
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第4题

_______ have caused much damage to the environment and people.s health. 选择一项： A. Too many cars B. Too many roads C
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