Hb的“氧缓冲”功能主要与哪项有关
A．氧离曲线形状
B．温度
C．何尔登效应
D．pH值
E．2，3二磷酸甘油酸
参考答案：A
The old lady who caught a bad cold complained that the doctor was ______ too much for the treatment given to her．
A．paying
B．offering
C．spending
D．charging
______吨=5000千克；7kg=______g；4100千克=______吨______千克．
