交感缩血管神经纤维支配密度最低的血管是（　　）。

A．Nuclear receptors are a class of transcription regulators that regulate the transcription of specific proteins by hormones.
B．Nuclear receptors are distributed across the cell membrane
C．When the receptor binds to the ligand, it is usually transferred to the nucleus for its function
D．The occurrence of breast cancer, prostate cancer and other tumors is related to abnormal regulation of nuclear receptor signaling pathway

A.丰水期
B.枯水期
C.平水期
D.冰封期

A.膝的半屈
B.膝的挤压
C.膝的内收外展
D.膝的旋转