脑啡肽属于()
A.生物碱类
B.哌啶类合成镇痛药
C.氨基酮类(芳基丙胺类)合成镇痛药
D.半合成镇痛药
E.内源性多肽
参考答案:E
-When are you coming to New York?
-Next Monday evening at nine o'clock. Can you meet me at the airport? __________,but I have an
appointment with my doctor. [ ]
A. Certainly
B. Sure
C. I'dlike to
D. No problem
《煤矿安全规程》规定,以下选项中的()的电话,应能与矿调度室直接联系。
A、井下主要水泵房
B、井下中央变电所
C、矿井地面变电所
D、地面通风机房