题型:名词解释 原核生物DNA修复包括3个步骤:________________酶对DNA链上不正常碱基的识别与切除,______________酶对已切除区域的重新合成,____________________酶对剩下切口的修补。 查看答案
题型:名词解释 —Where's Tom?—He is __ __ at the pool over there.A. swim B. swims C. swimming D. swiming 查看答案