【单选题】链霉素的提取中不用强酸性树脂而用弱酸性树脂,方便在后续步骤中将其洗脱下来。这与那个因素有关:
【判断题】The flags of England, Wales, Scotland and Northern Ireland can be found in the flag of the UK.
【单选题】人民是历史的创造者,是决定党和国家( )的根本力量。
【单选题】链霉素的提取中不用强酸性树脂而用弱酸性树脂,方便在后续步骤中将其洗脱下来,其中主要影响因素是:
【简答题】The United Kingdom is the 6th-largest national economy in the world (and 3rd-largest in Europe) measured by nominal GDP and 8th-largest in the world (and 2nd-largest in Europe) measured by purchasing ...