• 读、写、算dú _ xiě _ suàn the three R's
• 每分钟转数měi fèn zhōng zhuǎn shù revolutions per minute (r/m)
• 絮凝反应xù níng fǎn yīng flocculoreaction; F. R.
• 阴极射线管yīn jí shè xiàn guǎn cathode-ray tube (CRT); cathode-ray lamp; C-R tube

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