向北运动的板块使青藏高原隆升并向东运动，导致位于横断山区高山深谷的汶川县2008年5月12日14时28分发生了强烈的地震．向北运动的板块是指（　　）

A．亚欧板块

B．印度洋板块

C．非洲板块

D．太平洋板块

Which of the following factors would be most important in selecting the needle length to use for a subcutaneous injection of hydromorphone hydrochloride

A．The diameter of the needle.

B．The amount of adipose tissue at the administration site.

C．The amount of medication to be administered.

D．The viscosity of the solution to be injected.