科学家认为，公共广播系统、扩音器、自动门等利用超声波控制的设备日益增多，可能会导致“超声病”的流行。
Scientists say that a boom in public announcement systems, loudspeakers and automatic doors may be spawning an epidemic of ultrasonic sickness.
是一家专业生产、销售五金冲压件、钣金件、五金配件的加工型企业，服务的客户涉及机械、商用电器、仪表、汽车、自动门等行业。
It is a professional machining processing enterprises which produces and sales Metal stamping parts, sheet metal parts, metal parts.
圆弧形自动门是往复摆动，其运动参数是每分钟摆动次数、摆角大小和行程速比系数等。
The circular arc automatic door is reciprocating swing, and its motion parameters are the number of swing per minute, the size of the swing Angle and the travel speed ratio coefficient.
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