精密医疗器械(如人工心肺机、透析等)的消毒,可用()。
A.电离辐射灭菌
B.紫外线灭菌
C.煮沸消毒
D.高压蒸气灭菌
E.酒精消毒
参考答案:A
The main purpose of the talk is to ______.
A.illustrate how wheels, cameras and computers were invented
B.discuss how great inventions influence our way of living
C.compare people’s attitudes towards new inventions
D.compare inventions of the 19th century with that of the 20th century
下列有关生物多样性的叙述中,不正确的是( )
A.生物多样性是指生物种类的多样性
B.每种生物都是一个丰富的基因库
C.生物的种类越丰富,生态系统往往就越稳定
D.生态系统的多样性受到影响时,会影响生物种类的多样性和基因的多样性