Regarding the investigation method of experimentally revealing how the steel tube confining the concrete core for CFST columns, which of the following saying is not correct, please make a single choice. （ ）

A、Theconfiningpressureonconcretecoreisobtainedbasedonequilibriumequationofforces.
B、Theverticalstressinthesteeltubeisobtainedbasedonthestrainmeasurement.
C、TheconfiningpressureinbothrectangularandcircularCFSTcolumnscanbeobtainedinthisway.
D、Theverticalandhorizontalstraingaugesshouldmeasurethestrainatthesamepoint.