清渣容易、回转阻力小、钻进速度快。
Drilling fast, easy slag, the smaller the turning resistance.
此外还讨论了转向架回转阻力的定义和标准。
Furthermore, the definitions and standards of rotary resistance of bogies are discussed.
加速度测试法的先决条件是确定列车基本阻力、回转质量系数和列车质量，而其测试关键是列车加速度的测定。
The precondition of the acceleration testing method is the determination of the train resistance, rotary mass coefficient and train mass. The crucial test is measurement of train acceleration.
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