39. What is "metal-free fabrication process" mentioned in this article?
(A) to fabricate 1000 nm-deep nanochannel,
(B) to fabricate nanochannel with chromium mask,
(C) to fabricate nanochannel without chromium mask,
(D) to observe oxidation reaction,
(E) to keep chromium on the channel surface

相關試題

相關試卷