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【单选题】
下列各句中红色的字的意义与所给例句中红色的字的意义相同的一组是( ) 例句:较所 得 ,与战胜而得者,其实百倍。A.
“以地事，犹抱薪救火……”此言 得 之
B.
今日割五城，明日割十城，然后 得 一夕
C.
战败而亡，诚不 得 已
D.
吾恐秦人食之不 得 下咽也
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举一反三
【单选题】Which of the following statements about the matrix experiment is true?
A.
The subjects have to be highly intelligent to solve the matrices.
B.
A research assistant helps to count the correct answers.
C.
The subjects are paid according to how fast they solve the matrices.
D.
The researcher designed a variety of conditions for the matrix test.
【简答题】For the matrices A and B below since AB , please give trace (BA)
【多选题】Which of the following equations are true for square matrices A and B?
A.
det(A+B)=det(A)+det(B)
B.
det(AB)=det(A)det(B)
C.
det(2A)=2det(A)
D.
det(AB)=det(BA)
【多选题】Let A be a singular nxn matrix, which of the following statements are true?
A.
det(A)=0.
B.
adj A is singular.
C.
Ax=b has infinitely many solution.
D.
for every nxn matrix B, AB is singular.
E.
A can be written by product of some element matrices.
【单选题】We usually fold a letter in thirds , and is more common.
A.
z-fold
B.
tri-fold
C.
None of the above
【单选题】Which type of pocket square fold is less suited for formal attire?
A.
Presidential fold
B.
One-tip-up fold
C.
Two-tips-up fold
D.
Crown fold
E.
Puff fold
【简答题】A．hole B．none C．old D．fold
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