Which of the following is correct about the gene chip? A: It can simultaneously analyze the variation of multiple genes. B: Microarray sample density is very small. C: It can be used to study the expression of multiple genes. D: It is mainly used for the analysis of single gene structural variation.

What<br/>is the preparation of Bacillus Calmette-Guerin based on?() A: virulence<br/>variation B: structure<br/>variation C: morphology<br/>variation D: colony<br/>variation E: drug<br/>resistance variation

What<br/>is the preparation of Bacillus Calmette-Guerin based on?<br/>() A: virulence<br/>variation B: structure<br/>variation C: morphology<br/>variation D: colony<br/>variation E: drug<br/>resistance variation

Dialect refers to geographic variation, while sociolect refers to variation in terms of social group.

The variation and differential of a function are the same.

Caffe Breve is an American variation of a latte.

Instant messaging is a special variation of chat.

Isogonic lines are lines on a chart indicating （）. A: points of equal variation B: points of zero variation C: the magnetic latitude D: magnetic di

The degree of variation between ethnic groups in China not __________.

A selective sweep refers to what? A: The replacement of pre-existing genetic variation by the variation surrounding a selected allele B: Natural selection that targets a particular--"selected"--allele C: An advanced cognitive capability observed in expanded human social networks D: Patterns of phenotypic variation associated with assortive mating