【单选题】有关“表面结构”的基本概念,下列说法不正确的是()。
A.
为了保证零件的使用性能,在机械图样中需要对零件的表面结构给出要求
B.
轮廓算术平均偏差Ra它是在一个取样长度内,最大轮廓峰高与最大轮廓谷深之和
C.
表面结构就是由粗糙度轮廓、波纹度轮廓和原始轮廓构成的零件表面特征
【单选题】The bike ___ my sister. (belongs to / is belonging to)
【单选题】As he is going to work in Holland for two years, he will be parted from his two children.
【判断题】Demonstrate relationships among concepts are not belonging to the cognitive methods.()
【单选题】The pencil which you wrote just now me.
【单选题】Increase incontinence is a common fetures of UTI in
【单选题】Don’t take things________ others.
【单选题】It is five years ____ he lived here.In other words, he left here five years ago.
【简答题】https://www.wjx.cn/m/59826066.aspx