Due to the vastly improved metal casting and machining technologies which are now used, tight parts in new engines are not normal.
由于现在改进的金属铸造和机械加工技术的使用，新发动机里的紧配合反而不正常。
Tight-lock coupler casting yield can be increased by 9% and the consumption of raw materials reduced and the economic benefits increased.
通过本课题研究，密接式车钩铸件出品率可以提高9%，降低了原料消耗，提高了工厂的经济效益。
Tight-lock coupler casting yield can be increased by 9% and the consumption of raw materials reduced and the economic benefits increased.
通过本课题研究，密接式车钩铸件出品率可以提高9%，降低了原料消耗，提高了工厂的经济效益。
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