点沿轨迹已知的平面曲线运动时，其速度大小不变，加速度a应为：（）
A.A
B.B
C.C
D.D
参考答案：A
Adrenocorticotropic hormone (ACTH) is produced by which of the following cells
A．Chromophobes in the pars distalis
B．Neurosecretory cells in the median eminence
C．Acidophils in the pars distalis
D．Neurons of the paraventricular nucleus in the hypothalamus
E．None of the above
小舞蹈病是猩红热在神经系统的常见表现。本病多见于儿童和青少年。()
