【判断题】若质点系的动量守恒,那么该质点系所受外力系为平衡力系。
【单选题】计算毛利时,毛利=销售收入-销售成本,有关销售收入和销售成本说法错误的是()
A.
销售收入按含税德价格计算,销售成本按不含税的价格计算
C.
销售收入按不含税的价格计算,销售成本按含税的计算
【判断题】若一质点系所受合外力在直角坐标系的某个坐标轴上的分量为零,那么它在该坐标轴方向的动量分量守恒。
【单选题】Which of the following statements is INCORRECT?
A.
A language is a means of expressing a particular culture.
B.
All languages can well express their respective cultures
C.
American Indian languages are as sophisticated as English
D.
Some languages are better than other languages
【单选题】在 Word 编辑中,要移动或拷贝文本,可以用 来选择文本。
【简答题】Which of the following statements can best summarize the author' s view in the passage?