问题
名词解释
动态范围
答案
参考答案:在增益不变时,超声探伤仪荧光屏上能分辨的最大反射面积与最小反射面积波幅高度之比,通常以分贝表示
动态范围
参考答案:在增益不变时,超声探伤仪荧光屏上能分辨的最大反射面积与最小反射面积波幅高度之比,通常以分贝表示
第二卷(非选择题,共60分) 六:选词填空,用短语的正确形式填空(有一个是多余的,共10小题,每题1分,共10分)。
2. They have the development of science and technology. 3. The hotel can the first-class service guests. 4. If the plastic is burned, it will poisonous gas. 5. Sugar and starch(淀粉) are in the stomach. 6. You should trust me and I’ll be with you . 7. The speech made by Mr. Smith may the mysterious culture. 8. We will go there by bike on foot this afternoon. 9. The teacher asked us to tomorrow’s exam. 10. She had to _____________ the meat for her little dog. |