【简答题】Dear Sirs, We refer to the contract No.4632 covering 500 dozen track suits. We wish to remind you that we have had no news from you about shipment of the goods. As we mentioned in our last letter, we ...
【单选题】PR means __________:
【单选题】计算消力池池长的设计流量一般选择________。 ( )
【单选题】We made plans for a visit, but ______ difficulties with ear prevented it.
【单选题】The word' gains' in the second sentence in the last paragraph means ______.
【多选题】DI选择汇点输入连接时可直接连接( )。
【单选题】The author develops the discussion in paragraph 1 by means of__________.
B.
classifying different types
C.
providing historical background