题目:
Besides the electrons, an atom also contains positive electrical particles()total charge must be equal to that of the electrons.
A. which
B. that
C. whose
D. of which
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:间接摄影用X线胶片有荧光缩影片、CT片、X线电影片、X线复印片等。