对脊髓α运动神经元的描述正确的是()
A.发出纤维支配梭外肌
B.与固有束传导有关
C.是前角中的小型神经元
D.与肌张力的调节有关
E.不受皮质脊髓束支配
参考答案:A
We didn’t look after the old woman ____ we had an important meeting
yesterday.[ ]
A. as soon as
B. until
C. since
D. so
中压蒸气要求工作压力为()。