心源性哮喘宜选用（）。
A.肾上腺素
B.去甲肾上腺素
C.异丙肾上腺素
D.哌替啶
E.多巴胺
参考答案：D
根据句意、首字母、或中英文提示完成单词。
1. 1st J_____ is New Year's Day.
2. The tigers' t_____ are very sharp.
3. They do morning _____ (早操) at 9.25 every day.
4. September 10th is T_____ Day.
5. It's _____ (not easy, hard) for me to finish it in an hour.
技术的基本界定可以从哪几方面加以理解？
