纳洛酮拮抗使用大剂量纳洛酮可出现()
A.交感神经系统抑制
B.交感神经系统兴奋
C.副交感神经系统抑制
D.副交感神经系统兴奋
E.交感和副交感神经兴奋性无明显变化
参考答案:B
根据汉语提示写单词。
1. -How do you ____(度过)your summer holiday?
-I often read books.
2. We should ____ ____(向……学习)Lei Feng.
3. I ____(经常)go to the cinema.
4. Can you ____(抓住)a bird?
5. Are they ____ ____(听)the music?
切割钢管孔时容易产生什么问题?