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并不是所有科目都需要进行外币核算、数量核算设置。( )
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设α1，α2，α3，α4都是n维向量，判断下列命题是否成立． ①如果α1，α2，α3线性无关，α4不能用α1，α2，α3线性表示，则α1，α2，α3，α4线性无关； ②如果α1，α2线性无关，α3，α4都不能用α1，α2线性表示，则α1，α2，α3，α4线性无关； ③如果存在n阶矩阵A，使得Aα1，Aα2，Aα3，Aα4线性无关，则α1，α2，α3，α4线性无关； ④如果α1=Aβ1，α2=Aβ2，α3=Aβ3，α4=Aβ4，其中A可逆，β1，β2，β3，β4线性无关，则α1，α2，α3，α4线性无关；其中成立的为( )．
Social change is more likely to occur in heterogeneous societies than in homogeneous ones, simply because there are more diverse points of view available in the former. There are more ideas, more conflicts of interest, and more groups and organizations of different persuasions. In addition, there is usually a greater worldly interest and tolerance in heterogeneous societies. All these factors tend to promote social change by opening more areas of life to decision rather than subjecting them to authority. In a quite homogeneous society, there are fewer occasions for people to perceive the need or the opportunity for change, because everything seems to be the same and, if not satisfactory, at least customary and undisputed. Within a society, social change is also likely to occur more frequently and more readily (1) in the material aspects of the culture than in the non-material, for example, in technology rather than in values; (2) in what has been learned later in life rather than what was learned early; (3) in the less basic, less emotional, or less sacred aspects of society than in their opposites, like religion or a system of prestige; (4) in the simple elements rather than in the complex ones; (5) in form rather than in substance; and (6) in elements congenial to the culture rather than in strange elements. Furthermore, social change is easier if it is gradual. For example, it comes more readily in human relations on a continuous scale rather than one with sharp dichotomies. This is one reason why change has not come more quickly to Black Americans as compared to other American minorities, because of the sharp difference in appearance between them and their white counterparts. The author would most probably agree that changes are more likely to be successful in
1994年6月，财政部颁发了《会计电算化管理办法》等三个文件，标志着会计电算化工作被纳入法制化管理的轨道。( )
记账人员与经济业务和事项的审批人员、经办人员、财产保管人员的职责权限应当明确，并相互分离、相互制约。（）
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