Gerardus Mercator's projection, published in 1569, was immediately useful because it depicts a line of constantbearing as a straight line, which is handy for Marine navigation.
The quasi-superplasticity of leaded brass for bearing cage was investigated through the constant velocity tensile test.
通过恒速拉伸试验,对一种生产保持架用铅黄铜的准超塑性进行研究。
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The calculated results of rolling bearing stiffness indicate that larger preloading and constant pressure preloading for the rolling bearings of the spindle can improve the stiffness of main spindle.