衡量钢筋（）的指标包括屈服强度。
A、抗拉性能
B、塑性
C、焊接牢固程度
D、冷加工性能
参考答案：A
A．
B．
C．
D．
Sam ______ some knowledge of the computer just by watching others working on it.
A．brought up
B．looked up
C．picked up
D．set up
