螺杆式压缩机采用吸气阀和排气阀控制制冷剂蒸汽的吸入与排出。
参考答案：错
Look, the roller coaster !
A．how high speed; is moving
B．what high speed; is moving at
C．how a high speed; is moving at
D．what a high speed; is moving
政府职能的本质就是将统治阶级意志具体化，代表统治阶级实行政治统治和社会管理。 ( )
