针对外环流活塞泵运转时出现的汽蚀、震动问题，从理论上分析了转子型线与闭死容积、流速变化和发生汽蚀的内在关系；
To the problem of cavitation and shock that appears in the outside circulation piston pump running, the relation-ship between rotor profile and dead volume, flow rate and cavitation were analyzed.
秦先死写了一本有闭历史的薄薄的书，客岁出书了。
Mr Qin wrote a thick book on history and it was published last year.
秦先死写了一本有闭历史的薄薄的书，客岁出书了。
Mr Qin wrote a thick book on history and it was published last year.
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