【单选题】In today's working world the roles of men and women are becoming ( ).
【简答题】 大肠杆菌RNA聚合酶为多亚基酶,亚基组成是_______,称为_______酶,其中_______亚基组成称为核心酶,功能_______; σ 亚基的功能_______。
【单选题】普萘洛尔治疗心律失常的药理学基础是()。
【单选题】Today, Guinness is the (world's) widely distributed beer produced in (over) 40 countries and (sell) in around (130).