Regression coefficients are indicators of the impact of independent variables on dependent variables.

Graphs such as bar graphs and pie charts are limited in that they A: can only show variables that are positively related. B: can only show variables that have a negative correlation. C: provide information on only one variable. D: provide information on no more than two variables.

Which of the following statements is ? ( ) A: Java provides two primitive types for storing floating-point numbers in memory float and double. B: A floating-point number is a number with a decimal point. C: Variables of type float represent single-precision floating-point numbers and have seven significant digits. D: Variables of type float represent double-precision floating-point numbers; these require twice as much memory as double variables.

【多选题】What does “Market Segmentation” include? A: Geographic variables B: Demographic variables C: Psychographic variables D: Product-use variables

Which of the following is CORRECT about equations and variables.

C does not allow real data to be assigned to integer variables.

Which of the following statements are correct？（ ） A: Psychographic segmentation variables include consumer lifestyles. B: Psychographic segmentation variables include consumer brand loyalty. C: Psychographic segmentation variables include consumer personality attributes. D: Psychographic segmentation variables include consumer's benefit expectations of a product.

Market segmentation variables should always ________.

When we utilize tabular method for transportation problems, the criterion for the optimal solution is ( ). A: the test numbers of non-basic variables are greater than or equal to 0 B: the test numbers of basic variables are less than or equal to 0 C: the test numbers of basic variables are greater than or equal to 0 D: the test numbers of non-basic variables are less than or equal to 0

MySQL中查询系统变量的命令是（ ）。 A: show variables B: show variable C: check variables D: check variable