小明想测出一个额定电压已知的小灯泡的额定功率，设计了如图所示的电路．此实验中，通过____ 使灯泡两端电压为额定电压．若闭合开关后，发现小灯泡不亮，电压表无示数，电流表有示数，则可能的故障有____ ．

下列句子中没有语病的一项是（    ）

短文改错

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（∧），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。

    Nowadays more and more people who lives in cities like to keep dogs as pets. Some of my friend believe people can get comfort and develop their patient and love by keeping dogs as pets. Personally, I do not really have interest to dogs, and sometimes I do hate some dog owners. They can be so annoyed. They talk about their dogs as if they are actually their little babies. Some dogs make too much noise at night, that makes it hard for people living nearby fall asleep. Besides, not all dog owners think of others while they are walking their dogs. As really annoys me, though, is the way they let their dogs get out of the control.

下列不是地图基本要素的是（　　）