| 释义 |
Seca, R.
- secantadj. 割的；切的；交叉的 n. 割线；正割
- secrecyn. 保密；秘密；隐蔽
- secretaryn. 部长；秘书；书记；大臣；写字台
- 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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