环球航行中下列说法正确的是(  ) A.
每向东航行1周,经历的“昼夜”就少1天 B.
每向东航行1周,经历的“昼夜”就多1天 C.
每向西航行1周,经历的“昼夜”不变 D.
每向西航行1周,经历的“昼夜”就多1天

单项选择题You work for a development firm and must explain to a customer the results of a year-long study of potential sites for new stores. In what format should you develop this report?

单项选择题滚动轴承内圈孔径与轴颈配合应为A. 基孔制B. 基轴制C. 配合制D. 非配合制