A body is said to be a rigid body, when it has perfectly definite shape and size. The distance between all points of particles of such a body do not change, while applying any force on it A: 正确 B: 错误

Which of the following factors contribute to the displacements of a material point? ‍ A: Rigid-body translations B: Rigid-body rotations C: Strain deformations D: None

Which of the following states should be checked as the normal service limit state. ( ) A: The structure is out of balance as a rigid body B: Partial damage that affects the durability C: Not suitable to continue to bear the load any more due to excessive plastic deformation D: The component loses stability

Lots of young people in 1960s defied the rigid social ________.

A-frames and cylinder block is held together by _____ to form a rigid structure.

A machine____ is a machine for shaping or machining metal or other rigid materials

prim a.() A: proper B: formal C: rigid D: respectable

They sought to _________ the country _______ the old rigid traditions and to open it up to different cultures of the world

HTML文档结构由（）组成。 A: ＜html＞...＜/html＞、＜body＞...＜/body＞ B: ＜body＞、＜/body＞ C: ＜html＞、＜/html＞ D: ＜head＞...＜/head＞、＜body＞...＜/body＞

Smaller engines can be made more rigid than large ones and may not have （）.