下列各项指标中,()指标属于正指标。
A.净现值
B.现值指数
C.静态回收期
D.内含报酬率
参考答案:A, B, D
___ he made up his mind, nothing could change it. [ ]
A. Before
B. Unless
C. When
D. Once
点(1,-1,1)到平面x+2y-2z=0的距离是()。
A.1
B.1/3
C.4/3
D.3