Through the adjustment of valve timing,wide HCCI operation region with engine speed from 880 r/min to 4 000 r/min and p_(IMEP) from 0.25 MPa to 0.75 MPa can be obtained without intake charge heating.是什么意思_Through the adjustment of valve timing,wide HCCI operation region with engine speed from 880 r/min to 4 000 r/min and p_(IMEP) from 0.25 MPa to 0.75 MPa can be obtained without intake charge heating.在线翻译_英语_读音_用法_例句