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【单选题】
Facing growing costs and shrinking tax______, the government is now threatening to cut funding for environmental protection programs.A.
budget
B.
collection
C.
revenue
D.
profit
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举一反三
【简答题】目前（ ）是世界最大的棉花生产和消费国。
【简答题】国民收入核算中最基本的总量是__.
【单选题】A 25.0 mL sample of 0.15 M silver nitrate, AgNO3, is reacted with a 3.58 g sample of calcium chloride, CaCl2 (M = 111.0). Which of the following statements is true?
A.
Silver nitrate is the limiting reactant and calcium nitrate precipitates.
B.
Silver nitrate is the limiting reactant and silver chloride precipitates.
C.
Calcium chloride is the limiting reactant and calcium nitrate precipitates.
D.
Calcium chloride is the limiting reactant and silver chloride precipitates.
【简答题】100mL 0.100mol/L HA弱酸溶液，用25.0mL乙醚萃取，萃取后取出25.0mL水相，需20.0mL0.0500mol/L NaOH溶液与之中和，计算HA在有机相与水相中的比值为多少?
【单选题】Na2CO3可形成三种水合盐:Na2CO3·H2O、Na2CO3·7H2O、NaCO3·10H2O,在常压下,将Na2CO3投入冰-水混合物中达三相平衡时,若一相是冰,一相是Na2CO3水溶液,则另一相是:
A.
NaCO3·10H2O
B.
Na2CO3
C.
Na2CO3·7H2O
D.
Na2CO3·H2O
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