N20的中枢系统作用,正确的是()
A.吸入30%~50%有镇痛作用
B.吸入>30%有麻醉作用
C.降低颅内压
D.增加脑血流
E.麻醉作用极强
参考答案:A
It's freezing outside. You _______ put on your overcoat. [ ]
A. had better to
B. had better
C. would better
D. would better to
劳动行政关系中的相对人主要是指( )。
A.劳动者
B.用人单位
C.劳动仲裁机构
D.劳动者和用人单位