93. 關於下列敘述，何者為非？ (A) Type I alveolar cells (AT1) cover the great majority of the alveolar surface。 (B) The thin flattened AT1 cell is an important component of the air-blood barrier。 (C) AT1 cells exhibit MHCII presentation capacity that is substantially limited compared to professional antigen presenting cells。 (D) AT1 cells are actively involved in alveolar ion and fluid homeostasis。