对于一组呈正态分布的数值变量资料，若对每一个个体同减去一个不为零的数，则（）。

A.均数、标准差均不变

B.均数变、标准差不变

C.均数不变、标准差变

D.均数、标准差均变

E.以上均不对

According to the Regulations on Import and Export Tariff of the People's Republic of China, the duty-paying value of an export item should be its normal （） price with the export duties deducted and examined, approved by the Customs.

A. FOB

B. CIF

C. CFR

D. FCA