轴承标志板上的标记使用钢印刻打或激光刻写，字体高（）mm，行间距3mm。
A.3
B.5
C.6
D.7
参考答案：B
— Is this ______ backpack?
— No, it isn't. It's ______ backpack. [ ]
A. he, my
B. his, I
C. her, his
D. she, your
云是怎样形成的？
