[医] β[射]线

beta rays的用法和样例：

例句

Candidates may not retake a beta exam at any time.在任何时间都可以重考在线的无监考的考试。
The corona's rays flash out in a brilliant fan that has wispy spike-like rays near the Sun's north and south poles.光环带的光束像一把流光折扇，在太阳的南北两极附近形成纤细的辐射线。
The gun can fire invisible rays.这枪能发出看不见的射线。
Cathode rays are attracted by a positive charge.阴极射线被阳电荷所吸引。

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