Description
微分时间D的影响：微分作用的强弱主要看微分时问的大小。D越大，微分作用越强，这和积分时间刚好相反。微分作用越强，调节作用越强，其结果使振荡越来越剧烈，周期也越来越短。
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL B
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL B
AMD Athlon II X2 Desktop PC System w/BLUE RAY!
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM DIGITAL
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL
