第21题: [多项选择]对理想沉淀池中特定颗粒沉速的描述,正确的是( )。 A. 数值上与表面负荷相等 B. 小于该沉速的颗粒不能被去除 C. 代表沉淀池所能全部去除的颗粒中最小颗粒的沉速 D. 与表面负荷的物理意义相同 参考答案:A,C 答案解析:理想沉淀池中特定颗粒沉速是指沉淀池所能全部去除的颗粒中最小颗粒的沉速,小于该沉速的颗粒能被部分去除。该沉速在数值上与表面负荷相等,但概念不同。
A. He will pay by check. B. He will have the amount billed to his home address. C. He will give the woman cash. D. He will come hack to pay when he is billed. 参考答案:C 答案解析:[试题分析] 本题是细节题。 [详细解答] 先看题支,再有针对性的认真听。依据“I am just going to pay by cash”可以做出判断。