不要使材料的应力超过弹性极限,否则会产生永久变形。( )
A.Don' t let the stresses inside the material exceed the elastic limit but permanent deformation will result. B.Don' t let the stresses inside the material exceeding the elastic limit or else permanent deformation will result. C.Don' t let the stresses inside the material exceed the elastic limit or else permanent deformation will result.正确答案C
