单项选择题 不属于新型领导理论的是

未知题型 吸痰冲洗液可4小时更换一次，吸引瓶内吸出液不超过其高度的70%-80%（）

未知题型 In the Chinese creation myth, in the beginning of time, there was nothing in the universe except for _____ that took no shape.