某倾斜岩层在水平地面出露的厚度称为（）。 A.真厚度 B.视厚度 C.水平厚度 D.

执行下列语句，变量sum的值是______。 int sum=0； for(inti=1;i＜=3；i++) for(intj=1；j＜=i；j++) sum++；

The film      _ for half an hour.              [ ]

A. has begun          

B. has been begun      

C. has been on

Assume a firm uses a constant WACC to select investment projects rather than adjusting the projects for risk. If so, the firm will tend to:（）

A. reject profitable, low-risk projects and reject unprofitable, high-risk projects. 

B. accept profitable, low-risk projects and reject unprofitable, high-risk projects. 

C. reject profitable, low-risk projects and accept unprofitable, high-risk projects.

所谓“福利养懒汉”是指福利具有( )。

A．正功能

B．负功能

C．积极功能

D．消极功能

E．副作用

蛛网膜下隙（腔）