【单选题】For centuries, the Atlantic Ocean kept the America from ____________ by the people of Europe.
【单选题】在线粒体电子传递链中,只有( )不是递氢体 A、复合物 I B、复合物 II C、复合物 III D、复合物 IV
【单选题】The leading astronomers of the sixteenth and seventeenth centuries were fascinated by comets.
【单选题】(2019全国联赛,18)研究人员分离线粒体电子传递链的各组分,包括电子传递复合物I、II、III和IV等。如果试管中放入琥珀酸、CoQ、细胞色素c、复合物II和复合物III各组分,并提供氧气;或者在同样的体系中再加入抗霉素A,最终电子受体将分别是:
【单选题】支柱产业与( )的不同点在于,它首先侧重的是产值和利润水平,是国家和地方财政最重要的收入来源。
【单选题】现阶段,国家取得财政收入的最直接、最稳定、最主要支柱的形式是
【单选题】According to the passage, in the eighteenth and nineteenth centuries, some Americans ______.
A.
worked from sunrise to sunset seven days a week
B.
preferred working in factories to working on farms
C.
had many of the leisure time activities that people now have
D.
fought for shorter working hours and more leisure time
【判断题】电子传递链组分形成嵌入内膜的结构化超分子复合物,用毛地黄皂苷、胆酸盐等去垢剂处理可溶解外膜,将内膜分裂成四种仍保存部分电子传递活性的复合物 I II III IV。