—I left my handbag on the train, but luckily someone gave it to a railway official.

—How unbelievable to get it back! I mean, someone ______ it.

A．will have stolen

B．might have stolen

C．should have stolen

D．must have stolen

无缝道岔导轨、辙叉、心轨、翼轨的扣件扭矩应保持在（）。

A.700～900N•m

B.120～150N•m

C.1100～1400N•m

D.250～300N•m