The country itself didn’t have enough gas because of the war, so the government decided to  ________ its gas supplies to other countries.

A．hide away

B．cut off

C．insist on

D．break up

主机系泊试验时，由于（）应进行磨合试验。

A.主轴瓦或连杆大端轴瓦换新

B.吊缸检修但未更换零件

C.增压器检修

D.活塞杆填料函检修