【单选题】As the story ____, the secret of the castle is discovered little by little.
【判断题】纯净的水pH=7,则可以说pH值为7的溶液就是纯净的水。
【判断题】黄酮苷一般可溶或不溶于水,易溶于有机溶剂;黄酮苷元一般易溶于水,难溶于有机溶剂。
【判断题】纯净水的pH=7,则可以说pH为7的溶液就是纯净的水。
【单选题】Which of the following is TRUE according to the story?
A.
The little girl was kind and helpful.
B.
The video was a prize from the store.
C.
The writer paid for the video for the boy.
D.
The boy bought the video himself from the store.
【判断题】纯净水的PH=7,则可以说PH为7的溶液就是纯净水。
【判断题】( ) 在碱性溶液中OH—浓度就等于碱的浓度。