嵌体洞缘斜面的宽度一般为（）
A.0.5mm
B.1.0mm
C.1.5mm
D.2.0mm
E.3.0mm
参考答案：C
.
---Do you have the Harry Potter books by JK Rowling in your shop?
---Sorry, there is___________left at the moment.
A．nothing
B．no one
C．none
D．not one
酚妥拉明为
A．β-受体阻滞药B．β-受体激动药C．α-受体阻滞药D．α-受体激动药E．β、α-受体阻滞药
