【单选题】下列有关说法正确的是( )
A.
CO 2 、CH 4 、N 2 等均是造成温室效应的气体
B.
BaSO 4 在医学上用作钡餐,Ba 2+ 对人体无毒
C.
用二氧化碳生产肥料可以加剧地球温室效应,促进农作物营养平衡
D.
酶催化反应具有高效、专一、条件温和等特点,化学模拟生物酶对绿色化学、环境保护及节能减排具有重要意义
【简答题】请说出下列病句的错误根源 几声鸟叫从幽谷中传来,打破了沉寂的环境。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【单选题】在( )的情况下“或”运算的结果是逻辑0。
【单选题】在( )的情况下,逻辑运算“或非”的结果是逻辑“1”
【简答题】选择以下单词,填入下面短文中 invent, doubt, mention, nearly, website, all of sudden It is often difficult to decide on the inventor of certain inventions. This is because sometimes a few people may ______ thin...
【简答题】When I arrived at the Banner 1 ______________ I was so impressed by the fact that they came to me. I didn’t really want to 2. ______________. They came up to me and said, “Well, is there something we ...
【判断题】Manufacturers use standards so they can market their products to a wider audience than if they came up with separate – and perhaps incompatible – specifications.