属于前馈控制的是（）
A.急救物品完好率
B.压疮发生率
C.护理差错事故发生次数
D.查对医嘱及时纠正
E.基础护理合格率
参考答案：A
China will spend about 52 billion yuan _____ new airports and _____ old ones in the
west of China according to the 11th Five-Year plan. [ ]
A. repairing; building
B. to build; repair
C. building; repairing
D. to repair; build
EPON系统采用（）技术，实现单纤双向传输。
