钢中含碳量增加时,()、强度提高。
参考答案:硬度
— ______ didn’t Sally play the violin at the concert last night?
—She said that her hand hurt, but that was only an excuse. I saw her play tennis just now.
A.Why
B.Where
C.Which
D.What
公司债券可以转让,转让价格由转让人与受让人约定。( )