中度二尖瓣狭窄（）。
A.1.5～2.0cm4
B.≤2.0cm2
C.≤1.5cm2
D.≤1.0cm2
E.2.0～2.5cm2
参考答案：C
下述钻探方法中( )为岩芯钻进方法。
A．圆筒形钻头冲击
B．钻进 (D
In your project, there have been several changes in the cost and schedule estimates and the original estimating assumptions are no longer valid. What is the estimate at complete for your project ？（）
BAC=$300,000, AC=$100,000, EV=$150,000, CPI=$1.2, ETC=$120,000.
A．$250,000
B．$220,000
C．$280,000
D．$300,000
