Which of the following enabled mass production in the 1920s? a. standardization of spare parts b. mass availability of electricity c. introduction of the assembly line d. new precision-manufacturing technologies.

this is false i think

if it is a true or false question

assuming you are in the home page.

1) go to the upper right hand corner

2) click on your "profile picture"

3) go down to "edit profile"

4) it should be titled as "edit your profile", click on "profile picture"

5) choose a file

6) press "change"

you're profile picture is updated

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