19. Considering the following matrix: The eigenvalues of the matrix﹕ 

The eigenvalues of the matrix A are

(A)-1
(B)1
(C)6
(D)7
(E)2

20.  Which of the following statements are correct? (A) A linear system with fewer equations than unknowns may have no solution. (B) Every linear system with the same number of equations as unknowns has a unique solution. (C) A linear system with coefficient matrix A has an infinite number of solutions if and only if A can be row-reduced to an echelon matrix that includes some column containing no pivot. (D) If [A|b) and [B|c] are row-equivalent partitioned matrices, the linear systems Ax = b and Bx = c have the same solution set. (E) A linear system with a square coefficient matrix A has a unique solution if and only if A is row equivalent to the identity matrix.

21.  Which of the following statements are NOT correct? (A) Let A be a real n x n matrix. If A2 is invertible, then and A3 are invertible. (B) If A and B are invertible, then so is A+B, and . (C) Let A be a real m x n matrix and B a real n x m matrix. Then trace(AB) = trace(BA).  (D) Let A be a real m x matrix and B a real n x m matrix. Then det(AB) = det(BA). (E) Let A and B be real n x n matrices. Then AB = BA.

22.  Which of the following statements are NOT correct? (A) Any linear operator on an n-dimensional vector space that has fewer than n distinct eigenvalues is not diagonalizable.  (B) Two distinct eigenvectors corresponding to the same eigenvalue are always linearly independent. (C) If A is an eigenvalue of a linear operator T, then each vector in the eigenspace is an eigenvector of T.  (D) A linear operator 7 on a finite-dimensional vector space is diagonalizable if and only if the multiplicity of each eigenvalue A equals the dimension of the corresponding eigenspace .  (E) If A is diagonalizable, then   is also diagonalizable.

23.  Which of the following statements are NOT correct? (A) If S is linearly independent and generates V, each vector in V can be expressed uniquely as a linear combination of vectors in S. (B) Every vector space has at least two distinct subspaces. (C) No vector is its own additive inverse. (D) All vector spaces having a basis are fnitely generated. (E) Any two bases in a finite-dimensional vector space V have the same number of elements.

24.  Let W1 and W2 be subspaces of a finite-dimensional vector space V. Let ⊕ denote the direct sum. Which of the following statements are correct? (A) W1 ∩W2 is a subspace of V. (B) W1 ∩W2 is a subspace of V. (C) W1+W2 is a subspace of V. (D) If V = W1 ⊕W2, and β1 and B2 are bases for W1 and W2, respectively, then β1 and B2 = 0, and β1 ∪ β2 is a basis for V.  (E) If  W1 ⊕ W2 = V, then the dimension dim(V) = dim(W1)+dim(W2).

25.  Which of the following statements are correct? (A) If Q is orthogonal, then det(Q) = ±1.  (B) Let A be a real n x n matrix. Then A is symmetric if and only if A is orthogonally equivalent to a real diagonal matrix. (C) Let A ∈ be a matrix whose characteristic polynomial splits over . Then A is orthogonally equivalent to a real upper triangular matrix.  (D) Let T be a self-adjoint (Hermitian) operator on a finite-dimensional inner product space V. Then every eigenvalue of T is positive. (E) Let T be a self-adjoint (Hermitian) operator on a finite-dimensional inner product space V. Then every eigenvalue of T is negative.

51將生的食材或經過處理、熟製後的食材，與調味料拌勻，即可食用的菜餚，此烹調技法稱為(A)煮(B)川(C)拌(D)炒。

52利用水蒸氣的溫度，使食材熟透的一種烹調技巧稱為(A)煮(B)蒸(C)拌(D)炒。

53為使食材具有特殊香味的烹調法，以小火慢煮的方式，稱為(A)煮(B)川(C)炒(D)滷。

54三色蛋所使用的三種蛋是(A)鴨蛋、滷蛋、鹹蛋(B)雞蛋、皮蛋、鹹蛋(C)雞蛋、皮蛋、滷蛋(D)鴨蛋、雞蛋、鹹蛋。

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