試題詳解

14. Which one of the following descriptions about GC (gas chromatography) is correct?
(A) In GC, the stationary phase is liquid or solid, the mobile phase is gas.
(B) It can only be applied for gaseous samples.
(C) In order to obtain a complete separation, different gaseous mixtures are purged into the column successively.
(D) GC is not an efficient separation technique.
(E) All of these are correct.