单项选择题高氨血症导致脑功能障碍的生化机制是血氨增高后可 A、升高脑中的pH值 B、直接抑制呼吸链 C、抑制脑中酶的活性 D、升高脑中尿素浓度 E、大量消耗脑内的α-酮戊二酸
单项选择题The following items belong to the paper work a tour guide should have before picking up guests, except for__. A. itineraries B. hotel reservation form C. evaluation forms D. ticket settlement sheet