以下集合方法中,不能用于不可变集合的是()。 A: add() B: union() C: difference() D: symmetric_difference()

就一个对称问题进行有限元分析，若采用对称面切分后的一半模型进行建模分析，则在对称面上需要对________施加零值。As for a symmetric problem, if a segmentation of the plane of symmetry is carried out and then we do a half model modeling analysis, on the symmetric plane we should add a zero value term for the ______. A: 反对称位移anti-symmetric displacement B: 对称位移symmetric displacement C: 对称应力symmetric stress

Which of the following statement is false? A: If[img=77x23]1803b6aa763b00a.png[/img], where[img=77x23]1803b6aa7e8aab9.png[/img] and D is a diagonal matrix, then B is a symmetric matrix. B: An orthogonal matrix is orthogonally diagonalizable. C: An[img=44x19]1803b6aa8680eb5.png[/img]symmetric matrix has n real eigenvalues. D: An[img=44x19]1803b6aa8680eb5.png[/img]symmetric matrix hasnlinearly independent eigenvectors.

The rain did ______ to the game. A: take a difference  B: put a difference C: have a difference  D: make a difference

The abbreviation USB stands for Universal ( ) Bus. A: Syntactic B: Serial C: Sequential D: Symmetric

A cultural difference could be a difference in______

What’s the main obstacle in global communication? A: Climate difference B: Racial or national difference C: Geographical difference D: Cultural difference

Cross-cultural factors in international business negotiation includes: A: Difference in contract B: Difference in negotiating styles C: Difference in criterion and member of negotiators D: Difference in negotiating objectives

Climate change may be a big problem, but there are many little things we can do ______. A: making a difference B: to make a difference C: made a difference D: make a difference

When you are learning driving a car, it _____ whether you have a good teacher or not. A: makes a difference B: has a difference C: makes no difference D: has no difference