______, Charles doesn't look happy.
A. For all his large bank account
B. Instead of his large bank account
C. However his large bank account
D. Let alone his large bank account
It can be inferred from the text that most people who have no doubts about paranormal phenomena are probably ______.
A. ignorant of what life really is
B. enthusiastic about mass media
C. inclined to believe things readily
D. fond of psychic powers themselves
TLC中的比移值一般表示为
A. K
B. k
C. Rf
D. tR
E. R
HPLC除另有规定外，分离度应是
A. 小于1.0
B. 小于1.5
C. 大于1.5
D. 大于2.0
E. 大于5.0
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