城市污水处理方法中，不属于物理处理法的是( )。
A．筛滤法B．气浮法C．萃取法D．沉淀法
参考答案：C
______ and no way to reduce her pain and suffering from the terrible disease, the patient sought
her doctor's help to end her life. [ ]
A. Having given up hope of cure
B. With no hope for cure
C. There being hope for cure
D. In the hope of cure
滑轮的轮CAO壁的磨损不应超过原壁厚的（）%。
A、20%
B、10%
C、15%
D、25%
