有关影像的放大，正确的叙述是A．物片距越小放大率越大 B．焦片距越大放大率越大 C．
题型：单项选择题
问题：
有关影像的放大，正确的叙述是
A．物片距越小放大率越大
B．焦片距越大放大率越大
C．有效焦点越小放大率越大
D．X线摄影影像只有几何尺寸的改变称影像放大
E．以上都是正确的
题型：单项选择题
| 阅读理解。 | ||||
| ||||
| 1. The apartment with furniture is for _________ specially. | ||||
| A. families B. students C. tourists | ||||
| 2. The main cause of eyesight problems in School A is _________. | ||||
| A. reading in bed B. using computers C. watching TV | ||||
| 3. The number of the boys who had mobile phones in School B _________ from 2005 to 2007. | ||||
| A. increased rapidly B. grew slowly C. remained the same | ||||
| 4. In 2007, _________ girls had mobile phones in School B. | ||||
| A. 8 B. 14 C. 20 | ||||
| 5. If Jim has a cold, he should take _________. | ||||
| A. three cold pills each time B. the cold pills before meals C. the cold pills 3 times a day |
