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亚硫酸（H2SO3）的pKa1=1.90; pKa2=7.20，亚硫酸根（SO32-）的pKb1=
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举一反三
【简答题】Listen to the passage carefully and fill in the blanks with the information you hear. 1. In the past, I used to book a flight 1 , but now, I tend to 2 for good deals on plane tickets. 2. a plan...
【简答题】A Chinese airplane made an (1)_________________ Monday after its front window broke and one of its pilots was partly pulled out of the plane. The Sichuan Airlines passenger flight (2)______________fro...
【简答题】改错题。 1. A plane is a machine can fly. 2. It is one of the best pictures which have been sold. 3. Those that want to go put up your hands. 4. This is the knife with that the doctor did the operation. 5...
【简答题】Directions: The following is an advertisement. After reading it, you are required to complete the outline below it (No.1 to No.5). You should write your answers briefly (in not more than 3 words) on t...
【单选题】听力原文：W: The plane is leaving in haft an hour. M: Yes. now it's a quarter to five. Q: When will the plane leave? (3)
A.
At 5:15．
B.
At 5 o'clock．
C.
At 5:45．
D.
At 5:10．
【简答题】The timetable says that the plane _______ off at 8:30 every morning. A. took B. takes C. is taking D. had taken 2. For the whole period of two months, there ______ no rain ...
【简答题】(1) landed on the island of Oahu, Hawaii on Friday after being (2) the Pacific Ocean. The flight was the most erous part of the plane's planned 35,000-kilometer trip around the world. The trip is ...
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