活塞式制冷压缩机的卸载装置是对压缩机进行（）及便于启动的装置。
A、供油流量调节
B、冷量调节
C、供油压力调节
D、能量调节
参考答案：B
. ______ many people’s expectation, he was defeated in the first round.
A．In stead of
B．In spite of
C．Contrary to
D．On account of
管式加热炉一般由辐射室、对流室、余热回收系统、燃烧及通风系统及烟囱六部分组成。
