回购是指在出售证券时，与证券的购买商签订协议，约定在一定期限后按原价或约定价格购回所卖证券，从而获得即时可用资金的一种交易行为。( )
参考答案：对
He spent _____ time on his homework that he made a lot of mistakes. [ ]
A. such little
B. too little
C. so much
D. so little
简述行驶中钢板弹簧折断的判断与急救措施。
