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。
Astrophysics Research Corp-X-Ray-Inspection-System
GE 700 Complete Dental X-ray System Intraoral 2-Systems
GE Medical Systems X-Ray, Mamo Camera Printer, 5130/240
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL B
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL B
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL B
