【简答题】如图:AC=DF,AD=BE,BC=EF。求证:AC∥DF。
【单选题】According to the solubility of DF, DF can be divided into
A.
water-soluble DF & fat-soluble DF
C.
water-soluble DF and water-insoluble DF
D.
acid-soluble DF and alkali-soluble DF
【简答题】Listen to some sentences. Which dialogue does each one best fit? Write the letter in the space provided. 1. A: Did you want tea without milk? B: ( ) 2. A: See you at ten past one. B: ( ) 3. ...
【单选题】DF is the abbreviation for direction