原料性质对混匀制粒的影响有哪几个方面?
参考答案:
物料粘结性的影响;物料粒度的影响;物料比重的影响。
拉线与电杆之间的夹角一般为( )。
A.45°
B.30°
C.60°
D.15°
A68=year-oldman,withchroniccoughandsputumproductionfor17years,hadfeltaprogressivedyspneaslnce3years.HischestX-rayfilmshowedoverinflationoflungsanddescendeddiaphragms.Theperipheralvasculatureofthelungswasdiminished.Whichdis-easethepatientsufferedfrommostpossibly()
A.Pulmonaryemphysema
B.Chronicpulmonaryheartdisease
C.Pulmonaryarterialhypertension
D.Asthma
E.Bronchoectasis