净化、优化人才开发环境有助于建立有效的（）政策机制。
A.知识开发
B.人才开发
C.潜能开发
D.创新开发
参考答案：B
休克时静脉补充钾盐的注意点，以下哪几项错误（）
A.尿量>30ml/h
B.浓度不超过3%
C.滴速每分钟60滴
D.10%氯化钾日需量30ml（成人）
E.必要时以10%氯化钾静脉注射
Miss Jones ________ music at Barden School for five years when she was abroad and now she is an
actress.[ ]
A．had taught
B．has taught
C．taught
D．has been teaching
