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【单选题】
以下对骨组织细胞的描述,错误的是?A.
骨祖细胞、成骨细胞，骨细胞的胞质均呈嗜碱性
B.
破骨细胞的胞质呈嗜酸性
C.
骨陷窝和骨小管内含组织液
D.
破骨细胞靠骨质一侧可见大量不规则微绒毛， 形成皱褶缘
E.
骨细胞不具有溶骨作用
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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
【单选题】So ____ that no fish can live in it.
A.
the river is shallow
B.
shallow the river is
C.
shallow is the river
D.
is the river shallow
【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 ...
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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：
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