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The Jacobi determinant of a quadrilateral element is constant.()

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There are two characteristics of element stiffness matrix .()

The value of the Jacobi determinant in an isoparametric element cannot be equal to zero.()

By using the 0.618 method, two points a1=0.382 and b1=0.618 are determined within the search interval [a,b], so it can be known that the value of the interval [a,b] is ().

A. [0,0.382]
B. [0.618,1]
C. [0,1]
D. [0.382,1]

Which option does not use the first or second derivatives of the objective function in constructing the search direction in the following four unconstrained optimization methods?()

A. gradient method
B. Newton's method
C. variable scale method
D. coordinate rotation method