单项选择题

Graphical displays of accumulated cost and labor hours，plotted as a function of time，are called：（）

A.Variance reports
B.S curves
C.Trend analysis
D.Earned value reporting
E.Baseline control

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Going from Level to Level in the work breakdown structure will result in（）

A.Less estimating accuracy
B.Better control of the project
C.Lower status reporting costs
D.A greater likelihood that something will fall through the cracks
E.None of the above

多项选择题

蛋白质肺部给药系统存在的问题包括（）

A．长期给药后的安全性评价
B．用药的个体差异大
C．肺黏膜的吸收面积小
D．肺黏膜对大分子药物的透过性低
E．缺乏安全有效的吸收促进措施