elasticityеԷغ޵Էش 
gb4728_9_1D.1 еԷصĶϴ 
gb4728_9_1D.2 ޵ԷصĶϴ 
gb4728_9_1D.3 еԷصĶϴ 
gb4728_9_1D.4 мϿ˫򴥵
