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。 ( )