巴黎的医生们告诉75岁的密特朗总统，他的身体非常健康。President Mitterrand, 75, has been given a clean bill of health by doctors in Paris.密特朗总统昨天到达河内，以期结束长久以来殖民战争和冷战造成的敌意。President Mitterrand arrived in Hanoi yesterday to bury old colonial and col...
介绍了一种已实现工业应用的磨砂型材生产工艺.The process of grit dose used aluminium Profile fabrication industry is introduced.在粘土砂型铸造生产过程中经常出现夹砂类缺陷.In casting iron production casting iron scab flaw is often found.砂型铸造 - 手工造型 - 机器造型 ( 和壳型 )Sa...