Described are the structures and main technical parameters of pa series 730,731,731.25 and 750 diesel motor cars and DMUs in Russia.
介绍了俄罗斯PA系列730型、731型、731.25型和750型内燃动车、动车组的结构情况及主要技术参数。
Pa series amplifiers feature 3 kinds of operating states: double-channel, parallel, and bridging. They are selectable according to different situations.
PA系列功放设置三种工作状态：双声道，并联，桥接可以根据不同的场合选用。
This paper presents a series of detailed experiment of produced pa per pulp by alkali- salfite process from quick- growing tree, and confirms the steaming condition of produced bleached paper pulp.
本文对速生树的碱性亚钠法制浆作了较为详细的系列研究，确定了用这种制浆法制造可漂白软浆的蒸煮条件。
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