增加葡萄膜巩膜通道房水外流（）
A.缩瞳剂
B.β-受体阻滞剂
C.肾上腺素
D.前列腺素衍生物
E.碳酸酐酶抑制剂
参考答案：A, C, D
In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
A．has tried
B．has been tried
C．have taken
D．have been taken
活髓牙钉洞同位型要求钉洞的深度一般为（）。
A.0.5mm
B.1mm
C.1.5mm
D.2mm
E.3mm
