(DOOSAN)优点，拼装，立渤海尔(LIEBHER)，配件贵：价格更便宜，漏油严重，总性价比高，石川岛(IHI)：机械匹配性一般，液压是其强项，但是进口日立还有两个缺点1。
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日本航空宇宙技术研究所和石川岛播磨重工业公司目前正在开展这方面的研究工作。
LTD(IHI) is conducting development study of Air Turbo-Ramjet(ATR) engine, which is one of the most preferable candidate as an air breathing propulsion system of future space plane.
比如，昭荣汽船的背后是今治集团，而海商株式会社显然与石川岛播磨造船集团有关。
Shoei Kisen, for instance, is associated with Imabari, while Kaisho appears to be related to the IHI shipbuilding conglomerate.
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