【单选题】下列哪一选项不是偶然误差的特性( )。
B.
当偶然误差的个数趋向无穷大时,偶然误差的代数和趋向于零
【单选题】在Photoshop中,创建一新文件时,不可选择的色彩模式是()。
【单选题】According to Paragraph 4, what’s Jovce’s opinion about life in 1900? [ ]
A.
There were fewer problems for the family
B.
Life was simpler but worse than it is now
C.
There were things she liked and disliked
D.
The family had more time to stay together
【单选题】在PowerPoint 的“切换”菜单中,正确的描述是( ) 。
【判断题】( )高速切削是采用高转速,快进给,小背吃刀量和小进给量来去除材料的一种加工方式。 对