问题
单项选择题
普通X线治疗机复合滤过板的放置次序应该是（）
A、SnAlCu
B、CuSnAl
C、AlCuSn
D、SnCuAi
E、AlCuSn
答案
参考答案：D
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普通X线治疗机复合滤过板的放置次序应该是（）
A、SnAlCu
B、CuSnAl
C、AlCuSn
D、SnCuAi
E、AlCuSn
参考答案：D
| 综合填空。 | |
clothes. In the past, many Europeans and Americans believed that people wore their clothes 2 they didn't want other people to see their 3 bodies. Today we believe that people first started 4 clothes to 5 themselves from the sun, the wind, the rain, the cold and other bad weather. 1. 2. 3. 4. 5. |