题目内容

下列SPECT分辨率测试步骤(半高宽型)错误的一项

A. 探头去准直器，平行于X方向将模型置于视野中间，设置20%居中能窗，128矩阵，1000k以上计数，采集图像
B. 平行于Y方向置放模型，重复采集；去掉线源模型，精确测量模型上两线源之间的距离
C. 垂直于线源图像勾画3个像素宽的剖面线，求出剖面线上每一个像素的计数值，并将每个像素的计数值绘制在坐标纸上组成正态分布曲线
D. 测量坐标纸上两个波峰之间像素数，测量其中一正态分布曲线1/2峰高处的像素数
E. 用模型上两线源之间的精确距离除以图像上两峰值之间的像素数，得出像素尺寸，然后用正态分布曲线1/2峰高处宽度的像素数乘以像素尺寸即得到FWHM。

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简述代理记账的业务范围。

Windows系统中的磁盘碎片整理程序 (11) ，这样使系统可以 (12) 。

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English By Radio Each quarter hour program is broadcast nine times a day so that as many listeners as possible can hear it. A supplementary program is broadcast on weekdays at GMT 12:45 and GMT 21:30. On Sundays only there is an additional English by Radio program from GMT 12:15 to 12: 30: Monday COUNTDOWN—For students in their last six months of study for the Cambridge First Certificate. (I) From 20/10. ZERO ENGLISH—A new beginner’s series. (E) Tuesday IN A MANNER OF SPEAKING—a series of talks on English pronunciation in different parts of the world such as the British Isles, America and Australia. (A) Wednesday WEEKLY ECHO—A dialogue series illustrating everyday life in Britain and offering the listener practice in aural comprehension. (I) Thursday THE LANGUAGE OF BUSINESS—English for commerce. (A) Friday PLAY THE GAME—A quiz game that tests and teaches English. (I) Saturday CAN I HELP YOU—Answers listener’s questions on English grammar. (A) Sunday SPEAKING OF ENGLISH—A magazine grogram for teachers and students of English—quarter and half hour versions throughout the day. (A) GMT 12:15 PEDAGOGICAL POP—Learn English with pop songs. (I) * E=Elementary I=Intermediate A=Advanced TIME PROGRAMS CONTENTS Monday Zero English A new (46) series. (47) Weekly Echo A dialogue series illustrating everyday life in BritishIsles America and Australia. Friday Play The Game A (48) that tests and teaches English. Saturday Can I Help You Answers listener’ s questions (49) Sunday Speaking English A magazine program for (50) of English.