【简答题】FILL IN THE GAP WITH WORDS OR PHRASES GIVEN IN BOX. 只写单词前面的大写字母。 A . universal B. wander C. by a small margin D . without so much as E. barrier F. threaten G. feature H. civilize I. close up J. chart ...
【简答题】输气管道采用压气机加压,设进气的压力为0.1 MPa,温度为20 °C,而要求每分钟输出压力为0.3 MPa、温度不高于60 °C的气体80 m3,现有吸气量为每分钟8 m3的压气机,问需用多少台? the air in pipe line is compressed by air compressors with intake pressure 20 °C and pressure 0.1...