【多选题】下列关于二级声环境影响评价工作的基本要求说法正确的是( )。
A.
环境噪声现状以实测为主,可适当利用当地已有的环境噪声监测资料
B.
噪声现状调查可着重调查清楚现有噪声源种类和数量,其声级数据可参照已有资料
C.
对噪声级变化可能出现的几个阶段,选择噪声级最高的阶段进行详细的预测,并适当分析其他阶段的噪声级
D.
必须针对建设项目工程特点提出噪声防治措施并给出最终降噪效果
【简答题】建设项目环境影响评价是一项复杂的、程序化的系统性工作,其工作程序的依据是什么?一般可分为几个阶段?
【单选题】Suppose you find $20. If you choose to use the $20 to go to the football game, your opportunity cost of going to the game is
A.
nothing, because you found the money.
B.
$20 (because you could have used the $20 to buy other things).
C.
$20 (because you could have used the $20 to buy other things) plus the value of your time spent at the game.
D.
$20 (because you could have used the $20 to buy other things) plus the value of your time spent at the game, plus the cost of the dinner you purchased at the game.
【单选题】一个平面的三个投影中一个投影反应实形,则该平面为()
【单选题】在信息系统开发方法中,不属于结构化方法指导思想的是( )。