轴瓦做成双金属结构是为了节省贵重金属。
参考答案：错
They don’t have ______ color pencils, but I have ______ . [ ]
A. some; some
B. any; some
C. some; any
D. no; some
乳腺癌脑转移作全脑照射时，常用的剂量为（）。
A.20Gy/2w
B.30Gy/2w
C.40Gy/3w
D.45Gy/3w
E.50Gy/5w
