第4题: [单项选择]通风的有效性直接影响着爆炸性环境的存在和形成。其中由风和温度的配合效果而引起的空气流动或新鲜空气的置换属于( )。 A. 人工通风 B. 温度通风 C. 流动通风 D. 自然通风 参考答案:D 答案解析:本题考查了自然通风的定义,自然通风指的是一种由风或温度的配合效果而引起的空气流动或新鲜空气的置换。户外开放场所、户外开放式建筑物或具备良好自然通风条件的户内环境(如空气对流通道)的通风都可列为自然通风
第7题: [单项选择]From his talk with Professor Plant, we know that Michael ______. A. is a freshman B. is a bad student C. is declining in his course study D. has spent most of his time on course work 参考答案:C 答案解析:[听力原文]1-5
(knock on the door)
Professor: Come in. Come in.
Michael: Good morning Professor Plant.