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Owing to the greater girth of a ship amidships than at the ends,certain strakes are dropped as they approach the bow and stern to reduce the amount of plating at the ends. These strakes are called().
结核病多见于()..
调车程是指机车车辆不改变运行方向的一次调车移动。..
原种..
隔离开关的安装工序为()、()和()等。..
女,56岁,有房颤病史5年。突发眩晕、恶心呕吐6h来院。体检:.....
最易引起有肺气囊的肺炎病菌是()..