肾动脉狭窄患者应禁用()
A.血管紧张素转换酶抑制剂
B.钙通道阻滞剂
C.β受体阻滞剂
D.α受体阻滞剂
E.中枢交感神经抑制剂
参考答案:A
(2013·新课标全国卷Ⅰ)The door ________ open, no matter how hard she pushed.
A.shouldn't
B.couldn't
C.wouldn't
D.mightn't
预裂爆破、光面爆破一般采用()或()的装药结构。