Q.E.F.

US

UK

abbr.〈外(=quod erat faciendum)【数】这就是所要做的(=which was to be done)

E-C

E-E

abbr.

1.

【数】〈外〉(=quod erat faciendum)这就是所要做的 (=which was to be done),作毕,作讫