SORU: boş bırakılan yere parçanın anlam bütünlüğünü sağlamak için getirilebilecek cümleyi bulunuz
The simplest way to measure gravity is with a gravimeter, basically an extremely sensitive weighing device comprising a mass hanging on a spring. ----. But gravimeters are sensitive to movement, so it takes time to set up the equipment, and this makes surveys expensive.