以治疗前后量表SCL-90总分的改变来反映疗效,其评估标准是减分率≥25%为有效,减分率≥()为显效。
A.70%
B.75%
C.35%
D.50%
参考答案:D
氧气呼吸器的消毒与保管。
If a country wants to develop its economy successfully, there has to be a clear______of its social needs.
A.appreciation
B.assurance
C.assumption
D.assessment