Final answer:
The needling technique for DU meridian points in acupuncture is not specified for the options given. DU-9 is typically needled perpendicularly, implying that DU-8, DU-7, or DU-6 might be needled obliquely upward, depending on specific principles or textual references in TCM.
Step-by-step explanation:
According to Traditional Chinese Medicine (TCM) and specifically within the context of acupuncture, different points along the body's meridians are needled with various techniques to correct imbalances in the flow of qi, or life energy. The question pertains to the oblique upward needling technique for a point on the DU meridian. Among the options given (DU-9 zhi yang, DU-8 jin suo, DU-7 zhong shu, and DU-6 ji zhong), without access to specific CAM (Contemporary Acupuncture and Moxibustion) textbook directives, it's not possible to provide a definitive answer on which point should be needled obliquely upward. However, traditionally DU-9 (zhi yang) is needled perpendicularly, which means DU-8 (jin suo), DU-7 (zhong shu), or DU-6 (ji zhong) could potentially be needled obliquely, depending on the practitioner's approach and the patient's diagnostic needs.