Nim heard a discreet cough and turned his head to see Josie standing at the doorway.尼姆听见有人低咳了一声,转过头去,发现乔西站在门口.While Karen was speaking, Josie lifted down two lengths of steel channel from the van's interior.凯伦说话的时候,...
As cement retarder , the effect of desulphurize ashfuel oil ( DADFO ) was studied here.研究了石油焦脱 硫 灰渣用作水泥缓凝剂对水泥性能的影响.As a raw gas for carburizing, it is necessary to desulphurize in the gas sufficiently.所以作为渗碳用原料气必须对天然气充分脱...