“manual block”的概念、定义、翻译、参考文献-科学参考

单词	manual block
释义	manual block Encyclopedia 工学铁路区间闭塞释 manual block人工闭塞人工确认相邻两铁路车站间区间线路空闲、办理和解除闭塞，且在值班员与司机间人工交接行车凭证的闭塞方式。
随便看	projective homology group projective hyperplane projective ideal projective identification projective immersion projective incidence group projective infinitesimal structure projective invariance projective invariant projective isomorphism projective-iterative projective k-set projective k variety projective lattice projective length projective limit projective limit group projective limits projective limit space projective line projective linear group projective line element projective line geometry projectively affine projectively connected manifold

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