判断题 二级战备指公安消防部队在保卫任务繁重的重大节日、重大活动、恶劣气候或者重大自然灾害时所处的战斗准备状态。()

问答题 佝偻病的营养治疗原则?

未知题型 The causal relation encoded in the paragraph in Task 2.2 (Page. 51) is not a cause and effect in the conventional sense, but more of a logical deduction. Read the paragraph. Decide whether the following statements are true or false. 3. This paragraph starts with cause, followed by the elaboration of effects.