[电子]?无触点检波器

无触点检波器，无触点传感器

?免费的

...免费的 buckshee; cost-free; costs free; for free/ free of charge; franco; gebührenfrei; gratis; gratuitous - merited; no-charge; no-contact pickup; not charged; toll-free 免费地 for free; freely; gratuitously; on the cuff .