辊环安装加压时，先打磨轴头，后用（）擦拭干净。
A.卫生纸
B.水砂纸
C.碎布
D.湿布
参考答案：A
The little boy insisted that he______ nothing wrong and that he _____.
[ ]
A. should do; not punish
B. did; not punish
C. had done; not be punished
D. do; should not be punished
