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两根梁相交，主梁是次梁的支座，附加箍筋就设置在次梁上 。
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[音频]Three Gorges Dam (Yangtze River, China)---Dr. Paul BenjaminSize: ___1___ miles long and ___2___ feet tallReservoir ___3___ miles longWorkers: more than ___4___Benefits / Reasons for Building the Dam:Provides a ___5___ of energyControl floods on YangtzeRiver deeper, so ___6___ can travel farther up the riverRisks:Will put a lot of ___7___ underwaterMany ___8___ andvillages will probably disappearMany very ___9___ historical andcultural sites will be underwaterSignificant impact onthe ___10___
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