PET心肌显像的主要特点，下列错误的是（） A.发射正电子核素，如11C、13N等
题型：单项选择题
问题：
PET心肌显像的主要特点，下列错误的是（）
A.发射正电子核素，如11C、13N等
B.采用符合线路技术，使用机械准直，提高了探测效率
C.PET图像可以进行准确的定量分析，而SPECT只能进行定性或半定量分析
D.PET分辨率较高
E.PET较好地解决了组织重叠干扰心肌影像的问题
题型：单项选择题
| 阅读理解。 | ||||
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| 1. The volunteers can ______ in the community. | ||||
| A. clean up the houses B. build a house for the homeless C. look after pet animals D. help the people who are poor | ||||
| 2. Biosphere Expedition is likely to be held ______. | ||||
| A. for three months B. in the summer holiday C. only by local scientists D. between America and China | ||||
| 3. If Wu Dong is ______ years old, he can be a volunteer to help the little kids. | ||||
| A. 11 B. 13 C. 15 D. 17 | ||||
| 4. Which of the following is TRUE? | ||||
| A. The volunteer should create green areas for all the families. B. To join the holiday volunteer work, special skills are required. C. The volunteer can choose any service activity in the community. D. The student who doesn't study at school can be a volunteer to help the little kids. | ||||
| 5. What is the best tide for this passage? | ||||
| A. A Job Interview B. Volunteers Wanted C. Education Service D. An Expedition Club |
