【简答题】活塞式压缩机的主要零部件有:()、活塞组件、()、()、连杆、()、()、气阀等。
【单选题】喷射混凝土施工时,为防止混凝土因自重而脱落,可掺用适量______。
【单选题】The old professor has three sons,________are doctors.
【判断题】曲柄连杆机构的组成部件有 机体组、活塞连杆组和气门组。 ( )
【简答题】A.Grade all the homework. B.Clean the professor's office. C.Help the professor in the classroom. D.Sort all the documents.
【判断题】活塞连杆组的主要零部件有:活塞、活塞环、活塞销、连杆、连杆盖、连杆瓦、连杆螺栓等。( )
【简答题】A.The professor has graded the paper. B.The professor has been in the meeting all week. C.The professor hate, to grade the paper. D.The professor has read his paper on the meeting.
【简答题】A.Grade all the homework. B.Clean the professor's office. C.Help the professor in the classroom. D.Sort all the documents.