神经节细胞膜上的受体是
A．β1B．β2受体C．M受体D．N1受体E．N2受体
参考答案：D
气海位于脐中下（）寸，有（）的作用。
There are a lot of issues to consider in determining board independence. What would be the best definition of true "independence"（）
A. Independence, as it relates to board members, refers to avoidance of material conflicts of interest.
B. Independence, as it relates to board members, refers to the degree to which these persons are not biased or otherwise controlled by firm management or the outside audit group.
C. Independence, as it relates to board members, refers to the degree to which these persons are not biased or otherwise controlled by firm management or other groups which may have some degree of control over management.
