下列选项中,与UASB反应器运行管理不相关的是()
A.工艺参数控制
B.及时清除浮渣
C.及时排出剩余污泥
D.沼气的使用途径
参考答案:D
已知函数f(x)=x-1-lnx
(Ⅰ)求曲线y=f(x)在点(2,f(2))处的切线方程;
(Ⅱ)求函数f(x)的极值;
(Ⅲ)对∀x∈(0,+∞),f(x)≥bx-2恒成立,求实数b的取值范围.
The young scientist has made such great achievements in his chosen field ______ nobody else can make.
A.that
B.as
C.which
D.what