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【单选题】
配合物[CoCl(NH3)(en)2]Cl2中，中心离子的电荷数和配位数各为（）A.
+2 ， 4
B.
+2 ，6
C.
+3 ，6
D.
+3 ， 4
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举一反三
【单选题】根据下面材料，回答题。 The Drink Your Body Needs Most 1 Our bodies are estimated to be about 60% to 70% water. Blood is mostly water and our muscles, lungs, and brain all contain a lot of water. Water is needed ...
A.
Ounces of water needed per day
B.
Importance of water
C.
Composition of water
D.
Signs of dehydration
E.
Supply of water
F.
Necessity for bringing a bottle for water
【简答题】已知数列{a n }满足a 1 =1，a n+1 =2a n +1（n∈N * ）． （Ⅰ）求证：数列{a n +1}为等比数列，并求数列{a n }的通项公式； （Ⅱ）若数列{c n }的通项公式为c n =2n，求数列{a n ?c n }的前n项和S n ； （Ⅲ）若数列{b n }满足 4 b 1 -1 4 b 2 -1 … 4 b n -1 =( a n +1 ) b n (n∈ N *...
【单选题】We also need to plan_______ so that we're in a position to deal with the likely levels of climate change
A.
advance
B.
ahead
C.
alive
D.
alone
【简答题】The factors that add up to a happy life for most people are not what we typically hear about. Things like earning a ’s degree don’t make people happy over an extended period of time. Rather, the...
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