对于煤泥重介旋流器而言,如果要改善细粒物料的分选效果可以适当()旋流器的直径和适度加大入料压力。
参考答案:减小
已知f(x)=ax2+bx+c (a>0),α,β为方程f(x)=x的两根,且0<α<β,当0<x<α时,给出下列不等式,成立的是 ( )
A.x<f(x)
B.x≤f(x)
C.x>f(x)
D.x≥f(x)
—Which of the two T-shirts will you take?
—I’ll take . One is for my brother and the other is for myself.
A. both B. either C. neither