为什么活塞式压缩机各活塞环切口位置要相互错开?
参考答案:
活塞式压缩机各活塞环切口位置要相互错开可防止气缸内活塞往复运动时气体从切口处顺利地窜流,降低工作效率。
The look on his face showed that he was greatly of being left alone in the house.
A.terrified;terrifying
B.terrified;terrified
C.terrifying; terrifying
D.terrifying; terrified
最早记载汤熨、浴、寒痹药熨、豕膏膏法等外治法的医著为()
A.《黄帝内经》
B.《金匮要略》
C.《妇人大全良方》
D.《济阴纲目》
E.《医宗金鉴》