If you hurry up, I think it is quite ____ that you will catch the flight to Hong Kong . There are 40 minutes left.

A．probably

B．likely

C．possibly

D．certainly

关于蒸汽管道的温度应力的说法，正确的是（）。

A.受热后膨胀伸长，冷却后收缩

B.受热时为压缩应力，冷却时为拉伸应力

C.如果超过了材料的抗拉或抗压强度极限，管道就会变形

D.消除温度应力的方法通常是装补偿器