Ball bearings are rolling a ball ball mounted inner and outer rims rims in the middle, can withstand greater loads. Also known as ball bearings.
2013年7月26日星期五
Applied luminescent bacteria toxicity and environmental toxicity testing water quality
Is a kind of luminous bacteria in the normal physiological conditions of bacteria capable of emitting visible light. Luminescent Backing bearings in normal physiological conditions can be issued at 450 ~ 490nm wavelength blue-green to
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