It was on July 1, 2006 ___ Qinghai-Tibet railway began operation, ____ is a symbolic project in China’s West Development Strategy．

A．when; that

B．that; when

C．which; when

D．that; which

骨度分寸规定，髀枢至膝中的距离是：（ ）

A．13寸

B．14寸

C．16寸

D．18寸

E．19寸