判斷題已知A點(diǎn)相對(duì)高程為100m,B點(diǎn)相對(duì)高程為-200m,則高差hAB=-300m;若A點(diǎn)在大地水準(zhǔn)面上,則B點(diǎn)的絕對(duì)高程為300m.