我国对资本主义工商业的社会主义改造采取“非和平赎买”的政策。
参考答案：错
An analyst wants to determine whether the monthly returns on two stocks over the last year were the same or not. What test should she use if she is willing to assume that the returns are normally distributed（）
A. A paired comparisons test because the samples are not independent.
B. A difference in means test with pooled variances from the two samples.
C. An F-test with the greater mean in the numerator.
纤维的热稳定性
