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