What does the professor mean when he says this
A. Little is known about defining a substance as an air pollutant.
B. The substance isn’t an air pollutant when there is a very little in the air.
C. The substance can’t be judged to be an air pollutant only from its actual concentration level.
D. The actual concentration level means little to peopl
呼吸衰竭病人急救时可选用的药物
A. 可拉明
B. 肾上腺素
C. 硝酸甘油
D. 度冷丁
E. 20%甘露醇
患者,男性,36岁,半年前被派往非洲某国援建。回国后出现寒战,高热,体温最高39.5℃,持续4~5小时、体温降至正常。问隔6小时,体温再次升到39℃以上。 护士判断该患者最可能感染了
A. 疟疾
B. 乙型肝炎
C. 丙型肝炎
D. 血吸虫病
E. 结核
在Word中,段落格式与样式是同一个概念的不同说法。
A. 对
B. 错