16.原發(fā)性失眠的主要原因是(      )

A.精神沮喪                                                      B.環(huán)境變化

C.疼痛                                                             D.嘔吐

17.口腔厭氧菌感染時，漱口液首選(      )

A.2%～3%硼酸                                                B.1%～4%碳酸氫鈉

C.1%～3%過氧化氫                                         D.0.08%甲硝唑

18.導(dǎo)致壓瘡最主要的力學(xué)因素是(      )

A.水平壓力                                                      B.垂直壓力

C.摩擦力                                                         D.剪切力

19.肥胖指人體體重指數(shù)超過(      )

A.20                                                                B.25

C.30                                                                D.35

20.潛血試驗飲食可以選用的食物是(      )

A.雞蛋                                                             B.各種肉類

C.動物血                                                         D.各種蔬菜