【多选题】造成三元催化转化器的催化剂热失活的原因有( )。
【简答题】设A=[1 2 3;3 0 1;4 1 2],B=[2 0 0;-1 5 0; 1 9 -6],试编写程序求解下列问题 (1)求AB 的行列式; (2)提取矩阵B(A+B)的第2条对角线元素; (3)求解矩阵方程BX=2A-3E; (4)求矩阵4A+2B的特征值U与特征向量V。
【简答题】造成重整催化剂失活的主要原因有 、 、 等
【单选题】Everybody who can legally drink in this state is twenty-one or older. Sally is twenty-one or older. Therefore she can legally drink.
A.
affirming the consequent
B.
denying the antecedent
C.
undistributed middle fallacy
D.
confusing explanations with excuses
H.
miscalculating probabilities
【单选题】None of the people who gave blood are people who were tested, so everybody who gave blood must have been untested.
【判断题】按FOB和FCA术语成交,应由买方订立运输合同或指定承运人。按惯例,当卖方被要求协助订立运输合同时,只要买方承担费用和风险,卖方也可以办理。( )
【简答题】Everybody who ______ (wear) glasses will tell you their eyes have gradually got worse over time.
【单选题】FOB和FCA术语成交,应由买方订立运输合同或指定承运人。按惯例,当卖方被要求协助订立运输合同时,只要买方承担费用和风险,卖方也可以办理。( )
【简答题】设A=[1 2 3;3 0 1;4 1 2],B=[2 0 0;-1 5 0; 1 9 -6] ,试编写程序求解下列问题: (1)求行列式 ; (2)求矩阵B(A+B)对角线上的元素; (3)求解矩阵方程BX=2A+5E; (4)求A+2B的特征值U与特征向量V。
【判断题】In a business statistics class students sit randomly without particular preferences. A sample is selected by including everybody who sits in the first row. This is an example of a cluster sample.