Which of the following is not a binary operation on n? A: subtraction B: division C: addition D: multiplication

Multimedia（多媒体）一词中的Multi指的是英文单词（）。 A: Multiply B: Multitude C: Multiple D: Multiplication

Don’t think you can learn grammatical rules ______ you learn the multiplication tables. A: likely B: like C: alike D: dislike

‌Which of the following is equivalent?‎ A: The division relation on the set of integers B: On the set of rational numbers, the relation of multiplication equal to 1 C: rank relationship D: Logical equivalence of propositional formula

Which of the following is equivalent? A: The division relation on the set of integers B: On the set of rational numbers, the relation of multiplication equal to 1 C: rank relationship D: Logical equivalence of propositional formula

数字减影血管造影基于（ ）运算What operation does digital subtraction angiography use A: 加法Addition B: 减法Subtraction C: 乘法Multiplication D: 除法division

由细胞发育为具有特定功能的组织结构或器官的过程称为 （ ） A: cell multiplication B: cell differentiation C: cell division D: mitosis

Which step involves transformation? A: target DNA removed from cells and isolated B: cloning host takes up a plasmid C: target DNA and plasmid treated with the same restriction endonuclease D: desired protein is produced by cloning host E: gene is amplified by multiplication of cloning host

Which is the reason of dysbacteriosis () A: genetic properties of normal flora have changed B: drug resistance of normal flora have changed C: multiplication mode of normal flora have changed D: constitution and quantity of normal flora have changed E: shape and structure of normal flora have changed