【单选题】箱体类零件的零件图常用的表达方法不正确的是( )。
【简答题】B. Listen to five sentences. Write down the numbers described and the key words that help you get the answers. Example: You will hear: Our last claim was for £2,000, but this one will be three times t...
【单选题】已知集合M={x|x≤1},P={x|x>t},若 (M∩P),则实数t应满足的条件是 [ ]
【简答题】设有向量组α 1 =(1,1,1,3) T ,α 2 =(-1,-3,5,1) T ,α 3 =(3,2,-1,p+2) T ,α 4 =(-2,-6,10,p) T . (1) p为何值时,该向量组线性无关?并在此时将向量α=(4,1,6,10) T 用α 1 ,α 2 ,α 3 ,α 4 线性表出. (2) p为何值时,该向量组线性相关?并在此时求出它的秩和一个极大无关组.
【简答题】设向量组α 1 =(1,1,1,3) T ,α 2 =(-1,-3,5,1) T ,α 3 =(3,2,-1,p+2) T ,α 4 =(-2,-6,10,p) T
【简答题】Write five key words describing what rules best illustrated in my family. (my parents' ____ about children)
【简答题】Write down the key words you find out below. (no less than five)
【简答题】write five key words you interesting