平静呼气末肺内残存的气体量为
A．潮气量B．肺活量C．功能残气量D．残气量E．用力呼气量
参考答案：C
A bond portfolio manager owns $ 5 million par valfie of a noncallable bond issue. The duration of the bonds is 5.6 and the current market value of the bonds is $5125000. If yield decline by 25 basis points, the approximate new price of the bonds after the decline in yield will be closest to:（）
A. $5053250.
B. $5070000.
C. $5196750.
兴奋性突触后电位是（）
A．Na+
B．K+
C．Ca2+
D．Cl-
E．HCO-3
