【简答题】The following is a fairly formal reply to an invitation. Suppose the writer and the recipient were intimate friends, the words of the reply would be quite different even though the purpose and the con...
【判断题】气相色谱和液相色谱是根据固定相的状态来分类的。
【单选题】Directions: Rewrite the sentences replacing the long expressions with single words selected from the accompanying list . The name of the sender could not be found in any part of the letter The letter ...
【单选题】Directions: rewrite the sentences replacing the long expressions with single words selected from the accompanying list. The name of the sender could not be found in any poart of the letter. The letter...