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SSD照射，无论机架怎么旋转，照射的中心始终在（）上

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Decide whether the following statements are true (T) or false (F), based on the article “The Youngest Corporal in the Nazi Army”. 1. Alex Kurzem’s family was killed by the Nazis when he was 6 years old. 2. Alex survived the Nazi killing because he hid himself under his mother’s skirt. 3. While wandering alone in the forest, Alex slept in empty sheds and trees and begged for food at farmhouses. 4. The Nazi soldiers made Alex the mascot because they hoped the boy could bring good luck to their division. 5. The soldiers left Alex with a Nazi family when the fighting became too intense. 6. The only thing Alex remembered about his childhood was the word Koidanov, which he later found to be the name of his hometown. 7. People failed to discover Alex’s identity because he went to Australia soon after the war. 8. Alex’s lifelong wish was to put flowers on his mother’s grave. 9. It turned out that, instead of being a Jew, Alex was a Russian born in Minsk, Belarus. 10. Alex finally returned to his hometown and found out his real name with the help of a historian.

首选放射治疗的肿瘤是（）（）

（）（）的放化疗联合应用的疗效得到了一致的公认。

适形放射治疗的包括哪两类？