The addition and subtraction of vectors must be in the same length.
举一反三
- Which of the following is not a binary operation on n? A: subtraction B: division C: addition D: multiplication
- And by the mid-1970s, as the economy declined, hemlines dropped to mid-calf length and maxi (ankle) length.（ ）
- 数字减影血管造影基于（ ）运算What operation does digital subtraction angiography use A: 加法Addition B: 减法Subtraction C: 乘法Multiplication D: 除法division
- Let A be a [img=40x20]1803c4e60908a8b.png[/img]matrix, and the determinant of A is 0,then _________. A: there must be a column of elements in A that are all 0 B: there must be a column in A that is a linear combination of the other column vectors C: there must be two columns that are proportional to each other D: any column vector in A is a linear combination of the remaining column vectors
- Various researches have determined that the biggest wave load appears when a wave length is _____ the ship’s length.