This efficiency eliminates the need for large dwell volume for cooling that can delay or broaden gradients, a significant advantage when many samples need to be run in succession. Efficient and stable cooling of
A.require samples to be kept in refrigerators B.must use a large amount of samples C.may detect other deadly viruses as well D.have proven to be ineffective in practice 2. What does the underlined word “drawn” in Paragraph 5 probably mean?