正常成人胆囊超声测量的前后径一般不超过()
A.2.0cm
B.2.5cm
C.3.0cm
D.3.5cm
E.4.0cm
参考答案:C
— I'm sorry. I lost the key to your bike.
—________. I have another one.
A.You’re welcome
B.Oh, really
C.It doesn't matter
D.That’s all right
五苓散中的桂枝,一药二用,其作用是()