购货人的违约责任主要包括（）。

A.不能修理或调换的，按不能交货处理

B.临时变更到货地点且没提前通知供货人的，承担由此而多支付的费用

C.在合同约定的验收期限内，未进行验收或验收后在规定的期限内，未提出异议的，视为默认

D.在交售货物中掺杂使假、以次充好的，购货人有权拒收，供货人同时应向购货人偿付相应的违约金

E.没有按照合同约定按期付款的，按合同约定支付违约金，并按中国人民银行同期贷款利率支付相应利息

An analyst conducted a significance test to determine if the relationship between two variables was real or the result of chance. His null hypothesis is that the population correlation coefficient is equal to zero and his alternative hypothesis is that the population correlation coefficient is different form zero He developed the following information:（）

A. one-tailed test and can reject his null hypothesis. 

B. two-tailed test and can reject his null hypothesis. 

C. one-tailed test and cannot reject his null hypothesis.