干选系统主要由缓冲仓、给料机、干选机、袋式除尘器、()、引风机、主风机等组成。
A、含尘气体排出管
B、旋风除尘器
C、辅助风机
D、水膜除尘器
参考答案:B
Which of the following statements about the payback period is FALSE()
A. The payback period provides a rough measure of a project’ s liquidity and risk.
B. The payback period is the number of years it takes to recover the original cost of the investment.
C. The payback method considers all cash flows throughout the entire life of a project.
表明钢材在越过屈服点工作时可靠性的技术指标为( )。
A.比强度B.顺纹抗剪C.屈服强度D.抗拉强度