项目全寿命费用，就是项目从投资一开始一直到项目产品不能再继续利用为止所发生的一切费用。（）
参考答案：对
一个有理数的平方是正数，那么这个数的立方是 [ ]
A．正数
B．负数
C．整数
D．正数或负数
Anchor shackles should have a breaking strength that is（）.
A.equal to the chains they are connecting
B.25% more than the chains they are connecting
C.50% more than the chains they are connecting
D.100% more than the chains they are connecting
