电子线全身皮肤照射时,治疗控制深度一般在()以内
A.5mm
B.10mm
C.12mm
D.15mm
E.20mm
参考答案:C
秘书信息工作的基本要求有().
A.准确
B.及时
C.全面
D.适用
E.保密
Bill has two bikes. One is old, and _____ is new.[ ]
A. other
B. others
C. the other
D. the others