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【判断题】
物以类聚，人以群分体现了人际吸引的互补性A.
正确
B.
错误
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举一反三
【单选题】The river fish has been pulluted.
A.
was full of
B.
was filled with
C.
full with
D.
filled with
【单选题】CaC 2 O 4 ( K sp =2.32 ×10 -9 )在 0.1 mol × L -1 的 CaCl 2 溶液中的溶解度为( )
A.
4.81 ×10 - 5 mol × L -1
B.
1.32 ×10 - 3 mol × L -1
C.
8.34 ×10 - 4 mol × L -1
D.
2.32 ×10 - 8 mol × L -1
E.
1.16 ×10 - 8 mol × L -1
【单选题】计算 CaC 2 O 4 在 pH 为 5.00 的 0.050 mol∙L -1 (NH 4 ) 2 C 2 O 4 中的溶解度。 已知 CaC 2 O 4 的 K sp =2.0×10 -9 , H 2 C 2 O 4 的 K a1 =5.9×10 -2 , K a2 =6.4×10 -5 ( )
A.
4.6×10 -8 mol∙L -1
B.
4.6×10 -10 mol∙L -1
C.
4.6×10 -6 mol∙L -1
D.
1.3×10 -8 mol∙L -1
【单选题】CaC 2 O 4 的 K sp 为 2.6×10 - 9 ,要使 0.020 mol.dm - 3 CaCl 2 溶液生成沉淀,需要的草酸根离子浓度是 ( )
A.
1.3×10 － 7 mol.dm － 3
B.
1.0×10 － 9 mol.dm － 3
C.
5.2×10 － 10 mol.dm － 3
D.
2.2×10 － 5 mol.dm － 3
【单选题】Not until the fish died in the river how serious the pollution was.
A.
did the villagers realize
B.
the villagers realized
C.
the villagers did realize
D.
didn’t the villagers realize
【简答题】连词成句，我最棒！ 1. a live does where zebra ? 2. is judge a the monkey . 3. lives the river fish in a . 4. live a does a snake in hole ? 5. animal ...
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【单选题】The river fish has been pulluted.
A.
was full of
B.
was filled with
C.
full with
D.
filled with
参考解析：
知识点：
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