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搜题
【多选题】
账户一般应包括 （ ）要素。A.
账户名称
B.
日期和摘要
C.
凭证号数
D.
增加和减少金额
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知识点：
皮皮学刷刷变学霸
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】Sometimes in the afternoon, I, together with my cousins, went to the river to fish.
【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 ...
相关题目：
【单选题】The river fish has been pulluted.
A.
was full of
B.
was filled with
C.
full with
D.
filled with