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【单选题】
关于Na 2 CO 3 和NaHCO 3 性质的说法正确的是A.
等浓度时水溶液碱性：NaHCO 3 ＞Na 2 CO 3
B.
热稳定性：NaHCO 3 ＞Na 2 CO 3
C.
与盐酸溶液反应的速率(快慢)：NaHCO 3 ＜Na 2 CO 3
D.
向饱和 Na 2 CO 3 溶液中通入过量CO 2 ，有晶体析出
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举一反三
【单选题】We regret having received your offer too late, BECause we ____ our needs elsewhere.
A.
already cover
B.
already covered
C.
have already cover
D.
had already covered
【单选题】We regret to ________ you that our library will be closed next Wednesday, Thursday and Friday for the sports meeting. [ ]
A.
say
B.
speak
C.
inform
D.
notice
【单选题】We regret having received your offer too late, because we ____ our needs elsewhere.
A.
already cover
B.
already covered
C.
have already cover
D.
had already covered
【单选题】Much () our regret, we cannot ship the goods within the time limit of the L/C owing to the unforeseen difficulties on the part of mill.
A.
for
B.
on
C.
to
D.
at
【单选题】If we ________ now to protect our mother river ---Li Jiang River , we ‘ll live to regret it.
A.
haven’t acted
B.
won’t act
C.
don’t act
D.
hadn’t acted
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