As he was the only person who has the key, Simon felt himself（）suspicion. A: under B: in C: beyond D: upo

其供电线路所能承受的最大负载功率应满定全负荷运行供电要求，并设置专用（）保证对相关设备的不同断供电。 A: UPG B: UPO C: UPS D: UPH