穿过闭合回路的磁通量Φ随时间t变化的图象分别如图甲、乙、丙、丁所示，下列关于回路中产生的感应电动势的论述，正确的是（ ）
find, eraser, book, some, a, is, my, too, where, under
This is my desk. Two____ are on it. One is my English book, and the other (另一本) is my math book. You can also see (也能看见)____CDs on the desk. The CDs are ____. My pencil box is on the desk,____. A pen,____ eraser and a ruler ____ in it. The pen is black, the____ is yellow, and the ruler is white. ____ is my pencil? Aha, it's under the desk. Is my computer game ____the desk，too? No, it isn't. Where is it? I can't____it in my room.
在如图竖式中，A、B、C代表不同的数字：问「ABC」代表那个3位数呢？
的定义域是（ ）