The fourth point is extrapolated from the first three to form a parallelogram.

可从前三个点推断出第四个点以形成一个平行四边形。

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All of the three solder pastes could form plump and splendid solder point, and the appearance of Sn-Pb solder point was more regular and sleek.

三种焊锡膏均可形成饱满、光亮的焊点，锡铅焊点外观比无铅焊点更规整圆滑。

youdao

All of the three solder pastes could form plump and splendid solder point, and the appearance of Sn-Pb solder point was more regular and sleek.

三种焊锡膏均可形成饱满、光亮的焊点，锡铅焊点外观比无铅焊点更规整圆滑。

youdao