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【单选题】
CaF 2 的 K sp θ =5.3 × 10 -9 ,在氟离子浓度为 3.0mol.L -1 的溶液中 Ca 2+ 可能的最高浓度是( )。A.
1.8 × 10 -9 mol.L -1
B.
5.9 × 10 -10 mol.L -1
C.
1.8 × 10 -10 mol.L -1
D.
5.9 × 10 -9 mol.L -1
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举一反三
【单选题】Word formation excludes _____.
A.
affixation and compounding
B.
conversion and shortening
C.
cipping, acronymy and blending
D.
repetition and alliteration
【简答题】Most people attending his lecture have found that they have learned something (use) ______.
【简答题】看图填空。 Word List: pigs two four cows chickens 1. Three ______________ are on the farm. 2. ______________ ducks are in the pond. 3. Two ______________ are on the farm. 4. ______________ ____...
【单选题】Which of the following word shares the similar meaning with the word "compel"?
A.
force
B.
undertake
C.
support
D.
increase
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