________________________ are devices that provide additional stability and support for an individual who has trouble walking.?

Chest pain that occurs while the patient is at rest and does not go away on its own is called:

a. stable angina. b. unstable angina. c. myocardial infarction. d. cardiac tamponade.

Which of the following statements regarding steel columns is MOST accurate?

A) Because of low compressive strength, the cross-section of steel columns can be small compared to their length. B) The possibility of a steel column buckling is due to the alloys contained in the column. C) Columns that cannot rotate at their ends are less likely to buckle than columns that are free to rotate at their ends. D) The possibility of buckling is less with steel columns than with columns made of other materials.