| 释义 | 
             
                Salgado, R.
                
            Salvadorn. 萨尔瓦多(巴西东部港市)Selectricn. 电动打字机obligatoryadj. 必须的, 必要的;要求的, 应尽的
 读、写、算dú  _ xiě  _ suàn 
 the three R's阴极射线管yīn jí shè xiàn guǎn 
 cathode-ray tube (CRT); cathode-ray lamp; C-R tube絮凝反应xù níng fǎn yīng 
 flocculoreaction; F. R.每分钟转数měi fèn zhōng zhuǎn shù 
 revolutions per minute (r/m)
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