— Jack has got a bad cold.

— Yeah. I told him not to take off his coat, but it was stubborn of him　　　 my advice.

A．don’t take

B．didn’t take

C．not to take

D．not take

钢筋的主要力学性能有（）。

A.屈服强度

B.抗拉强度

C.断后伸长率

D.最大力总伸长率

E.冷弯试验