皮皮学，免费搜题
登录
搜题
【简答题】
把掺( )闪烁发光晶体层覆盖在光电二极管矩阵上,每个光电管就是一个像素,由薄膜态氢化硅制成。当 X 线入射到闪烁晶体层时被转换为可见光,由光电二极管矩阵转换成电信号,在光电二极管自身的电容上形成存储电荷,每个像素的存储电荷量与入射 X 线强度成( )。硅平板探测器的像素尺寸可达到 143μm × 143μm ,在 43cm × 43cm 的范围内像素可达 3120 × 3120 个。像素信息的读出方式与硒 FPD 相同,探测器内像素矩阵在行和列方向都与外电路相连并编址,在控制电路作用下,扫描读出各个像素的存储电荷,经 A/D 转换后输出数字信号,传送给计算机进行图像处理,输出图像。尽管 X 线在此探测器中先转换成可见光,又转换成电信号后再数字化输出,但从外部看,与硒 FPD 一样,它也是接受 ( ) 照射后直接输出数字化的图像信号。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】II. Cloze Test. (完形填空) (15%) Jackson and Thomas were good friends. They always 1 each other. One evening, Jackson said to his wife, “Thomas got married last month. I’d like to give 2 to him in his kit...
【多选题】在实际工作中，当总体规模较大时，一般不直接采用简单随机抽样，原因是( )。
A.
它比其他抽样方法效果差
B.
它要求有一个包含全部单位的抽样框
C.
计算公式复杂
D.
样本单位较为分散，调查不易实施
E.
无法对总体做出推断
【简答题】Fill in the blanks with the words or expressions given in the box below. Change the form where necessary. foreign exchange rank set up financial gear up signific...
【单选题】I _______rather have taken his advice. He is the last person who will betray you in the world.
A.
would
B.
should
【单选题】资产负债表的资产方主要项目的排列的标准是( )。
A.
根据其金额由大到小排列
B.
根据其入账日期由远到近排列
C.
根据其永久性由大到小排列
D.
根据其流动性的由大到小排列
【简答题】Mr. Evens works in Sydney. Last week he had a two weeks’ holiday, but he didn’t know where to go. He said to his friend Robert, “I hate the hot weather here, but I can’t find a cool place in Australia...
【简答题】Task 1 Read the passage, think about the following 5 questions and complete the answers. 1) What will the writer do with the experiences he got from different people on his journey? He will __________...
【单选题】“从含有N个个体的总体中抽取n个个体，使包含有n个个体的所有可能的组合被抽取的可能都相等”的抽样方法称为（）。
A.
简单随机抽样
B.
分层随机抽样
C.
系统随机抽样
D.
分段随机抽样
E.
整群随机抽样
【简答题】Child mortality decreased due to improvements in medical care and greater attention to problems related to proper _______. 由于医疗保健的改善和对适当营养问题的更多关注,儿童死亡率下降。
相关题目：