行程上下限均附安全距离设定，紧急停止键，程序力量及伸长设定，试件破坏感测。
Stroke protection, Force and Elongation protection, Emergency stop device, Sensing device when specimen is destroyed.
如果声音变得越分散或者难以聚焦，那表示改变距离设定后让喇叭与其他喇叭相位不正确了。
If the sound becomes more diffuse or harder to pinpoint, it is because changing the setting is putting it out of phase with the other speaker.
笔者所用的方法克服了现实情况中安全距离设定单一的弊端，对有毒重气泄漏安全规划等有指导作用。
The method could overcome the defect of single supposition in safety distance in reality, and provide guidance in safety planning for poisonous dense gaseous leakage.
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