题目内容:
Two typical spectra which recorded the two characteristic positions of the ring electrode with a He flux of 1,000 sccm are shown in Fig.2.
A.正确
B.错误
参考答案:
Two typical spectra which recorded the two characteristic positions of the ring electrode with a He flux of 1,000 sccm are shown in Fig.2.
A.正确
B.错误