Does anyone know how to change their username on :/

Technician a says that if a valve is open when a piston rises to the very top of a cylinder, the piston may actually strike the valve head and cause serious engine damage. technician b says if the camshaft is located in the engine block, then the engine is called an overhead valve engine, ohv engine, or an in-block camshaft. who is right? a. b only b. both a and b c. a only d. neither a nor b

What key should you press and hold to select and open multiple files at one time? enter alt control esc

Which explains extrinsic motivation? a)motivation in which there is a reward b)motivation that is personally satisfying c)motivation that is personally meaningful d)motivation in which the subject is interesting