钢筋混凝土用热轧带肋钢筋HRB500抗拉强度σb指标值为（）。
A.≥490Mpa
B.≥500Mpa
C.≥570Mpa
D.≥630Mpa
参考答案：D
Father insisted Tom _____ all his homework before he went to bed.
A．finishing
B．to finish
C．finish
D．finished
劳动者依法享有平等就业和自主择业的权利。
