题目

关于电容器的电容，下列说法正确的是（    ）A.电容器的电容与所带的电荷量成正比，与两端的电压成反比B.它是表征电容器容纳电荷量多少的物理量C.电容器没有带电时，电容为零D.电容器的电容由电容器本身决定，与它是否带电无关 答案：解析：电容器的电容是表征容纳电荷本领大小的物理量，其大小是由电容器的形状、结构决定的，与是否带电无关.例如平行板电容器的电容大小是由两板的正对面积、两板间的距离及两板间的介质决定的.答案：D假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加，删除或修改。增加：在缺词处加一个漏字符号（＾），并在其下面写出该加的词。删除；把多余的词用斜线（﹨）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1. 每处错误及其修改均仅限一词； 2. 只允许修改10处，多者（从第11处起）不计分。 When our six children were total young, suppertime was always being interrupted by neighborhood children ring the bell. They wanted one child or another to come out and played. Finally we had good idea. We hung a sign on the front door that was read: “We’re having dinner. Come back later.”  That night, we sat down to what they thought would be a pleasant, uninterrupted meals. But as soon as we began dinner, the doorbell rings. On the front door stood a five-year-old boy from across the street. He looked up at us and said, “I just want to know which the sign says.”