Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.
(1) Low pO2, low pCO2, more H+ , higher temperature
(2) High pO2, low pCO2, less H+ , lower temperature
(3) Low pO2, high pCO2, more H+ , higher temperature
(4) High pO2, high pCO2, less H+ , higher temperature