具有尺寸精确度高、表面光洁和强度较大等特点的板材是( )。
A．冷拉圆钢
B．冷拉优质型钢
C．热轧扁钢
D．热轧优质型钢
参考答案：B
.
. ----She looks so unhappy. Did you tell her the truth yesterday?
----Yes, but I ____ her later.
A．must have told
B．should have told
C．shouldn’t have told
D．mustn’t have told
