问题
选择题
Short hair is back ________ this year.The female workers in my office all had their long hair cut.[ ]
A. in common
B. in style
C. in trouble
D. in place
答案
答案：B
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Short hair is back ________ this year.The female workers in my office all had their long hair cut.[ ]
A. in common
B. in style
C. in trouble
D. in place
答案：B
，若A为正交矩阵，则a=______，b=______．