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In the shafting management () should be paid more attention. Ⅰ.f the while metal tailshaft bearing is dripping oil Ⅱ.f some area become blue during the running Ⅲ.he deformation of crankshaft
未受中原建城礼制影响的古城是()。..
大庆130型转盘的四角用直径()的双股钢丝绳及花篮螺丝与井架.....
库兹涅茨倒U型环境曲线有何借鉴意义?..
“液态镶嵌模型学说”认为细胞膜是由双层的()和镶嵌在其中.....
为了排除留在液压缸内的空气,对要求不高的液压缸,可将油口.....
解放CAl4l差速器轴承紧度是利用()..