乳腺手术选择放射状切口，可以减少下列哪项的损伤（）
A.皮肤
B.纤维组织
C.乳腺和输乳管
D.乳晕
参考答案：C
He has recently ____ tennis to relax himself in his spare time.[ ]
A. taken down
B. taken up
C. taken in
D. taken on
色谱分析中进样操作有哪些注意事项？
