【简答题】发动机润滑油的功能有哪些?机油品质的检验方法?
【单选题】When he caught a _______ of his girl-friend in the rain, Jack asked the taxi driver to stop to pick her up.
【单选题】The patient was making good progress but suffered a ______ when he caught a cold.
【单选题】再生障碍性贫血引起贫血的最主要原因是()
【单选题】When he caught a ( ) of his girl-friend in the rain, Jack asked the taxi driver to stop to pick her up.
【单选题】再障引起贫血的最主要原因是 . A.造血原料缺乏