题目

如图所示，水平金属板A、B分别与电源两极相连，带电油滴处于静止状态．现将B板右端向下移动一小段距离，两金属板表面仍均为等势面，则该油滴（） A . 仍然保持静止 B . 竖直向下运动 C . 向左下方运动 D . 向右下方运动 答案：D The illness from which Mary is suffering has now been _____ as hepatitis (肝炎). A. diagnosed B. determined  C. deduced D. discovered