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【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 +
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参考答案：
举一反三
【简答题】电路图中每一个电器元件都标有符号,其中S表示( ),F表示( ),Q表示( )。
查看完整题目与答案
【单选题】According to the selection, more than half of a person's body is composed of ______.
A.
voluntary muscles
B.
muscle fibers
C.
involuntary muscle
D.
sensory nerves
查看完整题目与答案
【单选题】It can be concluded from the passage that the author's attitude toward 'sex selection' is ______.
A.
negative
B.
positive
C.
neutral
D.
favorable
查看完整题目与答案
【单选题】按阳台与外墙面的关系分为( )。
A.
凸阳台、凹阳台、半凸半凹阳台
B.
有柱和无柱阳台
C.
悬挑和不悬挑阳台
D.
凸阳台、凹阳台
查看完整题目与答案
【单选题】按阳台与外墙面的关系分为( )。
A.
凸阳台、凹阳台、半凸半凹阳台和转角阳台
B.
有柱和无柱阳台
C.
悬挑和不悬挑阳台
D.
凸阳台、凹阳台
查看完整题目与答案
【单选题】The ManStop, Boston's hot new men's clothing store, offers a selection that is on range from conservative pin-striped suits for that day at the office to stylish cashmere pullovers for that night on t...
A.
is on range from
B.
ranging from
C.
ranges to
D.
ranges from
E.
having ranged from
查看完整题目与答案
【单选题】根据最新国家标准,将各种电气设备、装置和元器件划分为23个大类,每一个大类用一个专用单字母符号表示,其中继电器/接触器类用以下哪个字母表示
A.
K
B.
M
C.
C
D.
F
查看完整题目与答案
【单选题】The selection of spare spring in suction valve and delivery valve of first stage must bevery careful because_____.
A.
the spring assembly design is very critical to ensure correct valve action
B.
it is usual for the suction valve to have a lower spring pressure than the delivery valve
C.
the valve operates once every revolution and the valve movements are extremely frequent
D.
if the compressor is overheating wear and fatigue will occur
查看完整题目与答案
【单选题】电器元件符号F表示()
A.
信号开关
B.
发电机
C.
机械开关
D.
点火开关
查看完整题目与答案
【简答题】If natural selection was to account ______ the evolution of man's higher faculties, as Darwin was convinced it could, then those faculties must have a material basis.
查看完整题目与答案
相关题目：
【简答题】电路图中每一个电器元件都标有符号,其中S表示( ),F表示( ),Q表示( )。
查看完整题目与答案
【单选题】According to the selection, more than half of a person's body is composed of ______.
A.
voluntary muscles
B.
muscle fibers
C.
involuntary muscle
D.
sensory nerves
查看完整题目与答案
【单选题】It can be concluded from the passage that the author's attitude toward 'sex selection' is ______.
A.
negative
B.
positive
C.
neutral
D.
favorable
查看完整题目与答案
【单选题】按阳台与外墙面的关系分为( )。
A.
凸阳台、凹阳台、半凸半凹阳台
B.
有柱和无柱阳台
C.
悬挑和不悬挑阳台
D.
凸阳台、凹阳台
查看完整题目与答案
【单选题】按阳台与外墙面的关系分为( )。
A.
凸阳台、凹阳台、半凸半凹阳台和转角阳台
B.
有柱和无柱阳台
C.
悬挑和不悬挑阳台
D.
凸阳台、凹阳台
查看完整题目与答案
【单选题】The ManStop, Boston's hot new men's clothing store, offers a selection that is on range from conservative pin-striped suits for that day at the office to stylish cashmere pullovers for that night on t...
A.
is on range from
B.
ranging from
C.
ranges to
D.
ranges from
E.
having ranged from
查看完整题目与答案
【单选题】根据最新国家标准,将各种电气设备、装置和元器件划分为23个大类,每一个大类用一个专用单字母符号表示,其中继电器/接触器类用以下哪个字母表示
A.
K
B.
M
C.
C
D.
F
查看完整题目与答案
【单选题】The selection of spare spring in suction valve and delivery valve of first stage must bevery careful because_____.
A.
the spring assembly design is very critical to ensure correct valve action
B.
it is usual for the suction valve to have a lower spring pressure than the delivery valve
C.
the valve operates once every revolution and the valve movements are extremely frequent
D.
if the compressor is overheating wear and fatigue will occur
查看完整题目与答案
【单选题】电器元件符号F表示()
A.
信号开关
B.
发电机
C.
机械开关
D.
点火开关
查看完整题目与答案
【简答题】If natural selection was to account ______ the evolution of man's higher faculties, as Darwin was convinced it could, then those faculties must have a material basis.
查看完整题目与答案
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