According to the button bits test on optimum rotary Angle in cutting rock, the author put forward a view that is distinct from some specialists.

作者根据在实验室和矿山对柱齿钎头破岩的最优旋转角的测试结果，提出了与某些专家不同的看法。

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Built-in rotary switch, button, ampere meter, indicating lamp etc.

内装转换开关、电流表、按钮、指示灯等。

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Push the backlit engine-start button and the dashboard air vents automatically rotate open while the rotary shift knob rises up from the center console.

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