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 injecte

地震学的动力学观点认为：地震波是一种（），反射波是由（）迭加而成.