Cylinder heads with four valves flow more air than those with two valves because they

a macro is a tool that allows you to automate tasks and add functionality to your forms, reports, and controls. for example, if you add a command button to a form, you associate the button's onclick event to a macro, and the macro contains the commands that you want the button to perform each time it is clicked.

the answer is d.

by: nicholas dooley