问题
单项选择题
普通X线治疗机，可以产生哪种辐射()
A．粒子辐射，韧致辐射
B．特征辐射，韧致辐射
C．射频辐射
D．韧致辐射
E．微波辐射
答案
参考答案：B
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普通X线治疗机，可以产生哪种辐射()
A．粒子辐射，韧致辐射
B．特征辐射，韧致辐射
C．射频辐射
D．韧致辐射
E．微波辐射
参考答案：B
Lucy and Jim live in China. They 1 friends. They are 2 the same school. They have lessons from Monday to Friday. They 3 to school together in the morning. They have four classes in the morning and two in the 4 . They have lunch at school. After school, Lucy goes 5 and does her homework, 6 Jim stays at school. He plays basketball with his classmates. On Saturday Jim plays computer games at home but Lucy has to go to her 7 lessons in a music club. On 8 Jim stays at home and watches TV. Lucy has to learn to play 9 piano. Lucy is so busy. She has little time 10 . How she envies（羡慕） Jim!
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