是低温使水变成冰的 吗 ?Is it the low temperature that turns the water to ice?这是雪和冰的结晶体.It is snow and ice crystals.覆盖着冰的路面对驾驶汽车的人是个危险的隐患.Icy roads are a hidden danger to motorists....
Hypoid gear transmission is the most complicated transmission. The parameters of ma - chinking are hard to cakulate.准双曲面齿轮是齿轮传动中最复杂的, 其工艺锥参数和加工调整计算都涉及两个相错圆锥的相切接触条件.Fixtures are generally mechanical devices used to assist...
Through the process of the archives of inductiveness trimness and summary, providing reliable guidance.通过对工艺档案的归纳、整理与总结, 为生产提供可靠的指导.The findings are in the May issue of the Archives of Dermatology.研究结果见刊于五月份的《皮肤学文献集》杂志上....