中国大学MOOC: She was physically ______ and psychologically unstable.

When oxidation number of Cr is +Ⅳ, its oxide is usually<br/>unstable. ( ) A: yes B: no

The rising rate of crime is a(n) _____ of an unstable society.

Some systems can be unstable but with redundant constraints.

() show the tinker leads a wandering and unstable life.

The following structural system is:[img=148x70]1803b7fae44e645.jpg[/img] A: Stable without redundant restraint B: Stable with redundant restraint(s) C: Unstable D: Instantaneously unstable

The following structural system is:[img=279x167]1803b7fa72c1d55.jpg[/img] A: Stable without redundant restraint B: Instantaneously unstable C: Unstable D: Stable with redundant restraint(s)

The following structural system is:[img=126x72]1803b7fac49252c.jpg[/img] A: Unstable B: Instantaneously unstable C: Stable without redundant restraint D: Stable with redundant restraint(s)

The following structural system is:[img=126x70]1803b7facf36643.jpg[/img] A: Stable without redundant restraint B: Stable with redundant restraint(s) C: Instantaneously unstable D: Unstable

The following structural system is:[img=153x101]1803b7fad9a6845.jpg[/img] A: Stable without redundant restraint B: Stable with redundant restraint(s) C: Instantaneously unstable D: Unstable