题目内容
（请给出正确答案）
A Cartesian diver was called a ' devil' by some people because
A．they saw it was black.
B．they believed in the supernatural.
C．they wanted the inventor to be famous.
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更多“A Cartesian diver was called a ' devil' by some people becauseA．they saw it was black.B．th”相关的问题
A、science and religion
B、justice and mercy
C、mind and matter
D、truth and falsehood
A.empiricism
B.existentialism
C.subjectivism
D.rationalism
A、refuse to believe that there is a god governing human affairs
B、refuse to acknowledge the validity of Grecian observations about the world
C、refuse to accept anything as true if there is any possibility that it is not
D、refuse to commit ourselves to the dictates of any institution
4. In the OXYZ Cartesian coordinates, a stress state of a point is
(1) Draw the stress unit cube with the stresses labeled on X, Y and Z planes; (6 points)
(2) One of the X, Y and Z planes is a principal plane. Which is the principal plane, and what is the principal stress on it？ (4 points) (3) Find the characteristic equation of the stress state, and solve the other 2 principal stresses at this point; (6 points) (4) Calculate the maximum shear stress and the mean stress at this point. (4 points)
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