试题范例

5 ﹒ Whichofthefollowingismostcommonl：a）methylmercury b）glyoxal c）combinationofformamideandformald d）phenol 6 ﹒ Theefficiencyofpulsed‐fieldgelelectrophoresismaybeaffe：a）switchinterval b）voltagegradient. ......