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【单选题】
为消除可摘局部义齿不稳定，错误的方法是（）
A.
增加对抗平衡固位体
B.
尽力设计黏膜支持式义齿，以避免产生支点
C.
在支点或支点线的对侧加平衡力
D.
消除合支托，卡环在上形成的支点
E.
消除基托下与组织形成的支点
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举一反三
【单选题】The 5 paragraphs attached here are taken from the reading passage. Which paragraph contains the following information? You may not choose the same paragraph more than once. Reading for main ideas.pdf ...
A.
Paragraph 11
B.
Paragraph 12
C.
Paragraph 13
D.
Paragraph 14
E.
Paragraph 15
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【单选题】Which of the following sentences expresses a fact? A. Mary and her son must be home by now. B. Careless reading must give poor results. C. It’s getting late, and I must leave now. D. He must be workin...
A.
选择1
B.
选择2
C.
选择3
D.
选择4
查看完整题目与答案
【简答题】已知 K sp ( MgF 2 ) = 6.5 × 10 -9 ,将10.0 mL 0.245 mol / L Mg(NO 3 ) 2 溶液与25.0 mL 0.196 mol / L NaF溶液混合,是否有MgF 2 沉淀生成 。
查看完整题目与答案
【单选题】While reading the newspaper, ________.
A.
a colorful ad caught my eyes
B.
my attention was attracted by an ad
C.
I was attracted by a colorful ad
D.
what attracted me was a colorful ad
查看完整题目与答案
【单选题】将 2×10 -2 mol/L NaF 溶液与 2×10 -4 mol/L Fe 3+ 的强酸性溶液等体积混合后 , 溶液的 pH=1.0 。此时铁络合物的主要存在形式是 ( 已知 HF 的 p K a =3.2, Fe 3+ -F - 络合物的 lg β 1 ~lg β 3 分别为 5.3,9.3, 12.1)
A.
FeF 2
B.
FeF 3
C.
FeF 2+ 和 FeF 3
D.
FeF 2 +
查看完整题目与答案
【单选题】将2×10【图片】mol·L【图片】 NaF溶液与2×10【图片】mol·L【图片】 Fe【图片】溶液等体积混合, 并调pH为1.0。此时铁的主要存在形式是（ ）。[已知Fe-F络合物的lgβ1-lgβ3分别是5.3, 9.3, 12.1, pKa(HF)=3.2]
A.
Fe
B.
FeF
C.
D.
查看完整题目与答案
【多选题】将 2×10 -2 mol·L -1 NaF 溶液与 2×10 -4 mol·L -1 Fe 3+ 溶液等体积混合 , 并调 pH 为 1.0 。此时铁的主要存在形式是( )。 [ 已知 Fe-F 络合物的 lgβ 1 -lgβ 3 分别是 5.3, 9.3, 12.1, p K a (HF)=3.2]
A.
Fe 3+
B.
FeF 2+
C.
FeF 2 +
D.
FeF 3
查看完整题目与答案
【简答题】Read the attach ed text and choose the one that you think is the best answer to the corresponding questions. Reading 14.docx
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【单选题】After a short rest, he came back to he had stopped and continued reading.A．whereB．whichC．in which
A.
14．After a short rest, he came back to he had stopped and continued reading. A．where
B.
which
C.
in which
D.
that
查看完整题目与答案
【单选题】将2×10 -2 mol·L -1 NaF溶液与2×10 -4 mol·L -1 Fe 3+ 溶液等体积混合, 并调pH为1.0。此时铁的主要存在形式是( )。[已知Fe-F络合物的lgβ 1 -lgβ 3 分别是5.3, 9.3, 12.1, p K a (HF)=3.2]
A.
Fe 3+
B.
FeF 2+
C.
FeF 3
D.
Fe
查看完整题目与答案
相关题目：
【单选题】The 5 paragraphs attached here are taken from the reading passage. Which paragraph contains the following information? You may not choose the same paragraph more than once. Reading for main ideas.pdf ...
A.
Paragraph 11
B.
Paragraph 12
C.
Paragraph 13
D.
Paragraph 14
E.
Paragraph 15
查看完整题目与答案
【单选题】Which of the following sentences expresses a fact? A. Mary and her son must be home by now. B. Careless reading must give poor results. C. It’s getting late, and I must leave now. D. He must be workin...
A.
选择1
B.
选择2
C.
选择3
D.
选择4
查看完整题目与答案
【简答题】已知 K sp ( MgF 2 ) = 6.5 × 10 -9 ,将10.0 mL 0.245 mol / L Mg(NO 3 ) 2 溶液与25.0 mL 0.196 mol / L NaF溶液混合,是否有MgF 2 沉淀生成 。
查看完整题目与答案
【单选题】While reading the newspaper, ________.
A.
a colorful ad caught my eyes
B.
my attention was attracted by an ad
C.
I was attracted by a colorful ad
D.
what attracted me was a colorful ad
查看完整题目与答案
【单选题】将 2×10 -2 mol/L NaF 溶液与 2×10 -4 mol/L Fe 3+ 的强酸性溶液等体积混合后 , 溶液的 pH=1.0 。此时铁络合物的主要存在形式是 ( 已知 HF 的 p K a =3.2, Fe 3+ -F - 络合物的 lg β 1 ~lg β 3 分别为 5.3,9.3, 12.1)
A.
FeF 2
B.
FeF 3
C.
FeF 2+ 和 FeF 3
D.
FeF 2 +
查看完整题目与答案
【单选题】将2×10【图片】mol·L【图片】 NaF溶液与2×10【图片】mol·L【图片】 Fe【图片】溶液等体积混合, 并调pH为1.0。此时铁的主要存在形式是（ ）。[已知Fe-F络合物的lgβ1-lgβ3分别是5.3, 9.3, 12.1, pKa(HF)=3.2]
A.
Fe
B.
FeF
C.
D.
查看完整题目与答案
【多选题】将 2×10 -2 mol·L -1 NaF 溶液与 2×10 -4 mol·L -1 Fe 3+ 溶液等体积混合 , 并调 pH 为 1.0 。此时铁的主要存在形式是( )。 [ 已知 Fe-F 络合物的 lgβ 1 -lgβ 3 分别是 5.3, 9.3, 12.1, p K a (HF)=3.2]
A.
Fe 3+
B.
FeF 2+
C.
FeF 2 +
D.
FeF 3
查看完整题目与答案
【简答题】Read the attach ed text and choose the one that you think is the best answer to the corresponding questions. Reading 14.docx
查看完整题目与答案
【单选题】After a short rest, he came back to he had stopped and continued reading.A．whereB．whichC．in which
A.
14．After a short rest, he came back to he had stopped and continued reading. A．where
B.
which
C.
in which
D.
that
查看完整题目与答案
【单选题】将2×10 -2 mol·L -1 NaF溶液与2×10 -4 mol·L -1 Fe 3+ 溶液等体积混合, 并调pH为1.0。此时铁的主要存在形式是( )。[已知Fe-F络合物的lgβ 1 -lgβ 3 分别是5.3, 9.3, 12.1, p K a (HF)=3.2]
A.
Fe 3+
B.
FeF 2+
C.
FeF 3
D.
Fe
查看完整题目与答案