正常开车时中和系统剧烈振动的原因有()。
A、重排混合物中烟酸过量
B、中和温度低
C、中和pH值高
D、混合器坏
参考答案:A, D
新生儿复苏需要使用肾上腺素时,最佳的给药途径是()
A.直肠内
B.气管内
C.颈静脉
D.心内注射
E.皮下注射
If you want to advance yourself in your studies, you will first have to ________ yourself of those shortcomings that can become barriers to progress.
A.remove
B.react
C.rid
D.reduce