煤与瓦斯突出矿井掘进工作面局部通风机应采用什么通风？
参考答案：
压入式。
A 26-year-old primigravida is in labor. Her cervix is 5 cm dilated and 75% effaced; the fetus is at 0 station. The client requests medication to relieve the discomfort of contractions, and the physician prescribes an epidural regional block. What position should the nurse help the client to assume when the epidural is administered
A. Lithotomy.B. Supine.C. Prone.D. Lateral.
骨骼肌血管的优势受体是：
A．α1受体B．β1受体C．β2受体D．M受体E．N受体
