全国首次国产混凝土机械、钢筋机械、凿岩机械产品质量用户评价结果１９９２年１２月为协助用户选购优质产品并促进厂家提高产品质量，自１９９２年３月起对用户单位自１９８９年以来使用的国产混凝土、钢筋、凿岩机械产品质量进行了用户评价调查，用户认为质量较好的产品... For the first time in the country, the results of user evaluations of domestic concrete machinery, steel machinery, and rock drilling machinery products were used since December 1992 to help users purchase quality products and promote manufacturers to improve product quality since March 1992. The quality of concrete, steel, and rock drilling machinery products was evaluated by users. The users thought that the products were of better quality...