《灵枢·根结》篇曰：“用针之要，在于知调（）。”
参考答案：阴与阳
I was deep in thought, so I didn't notice _____.
A．him to come in
B．him come in
C．he come in
D．him coming in
导致工业性皮肤病最常见的机械性损伤是()
A．摩擦
B．色素沉着
C．胼胝
D．甲损伤
