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【单选题】
在稀的砷酸溶液中,通入 H 2 S 以制备硫化砷( As 2 S 3 )溶胶,该溶胶的稳定剂是 H 2 S ,其胶团结构式( )。A.
[(As 2 S 3 ) m · n H + ·( n - x )HS - ] x - · x HS -
B.
[(As 2 S 3 ) m · n HS - ·( n - x )H + ] x - · x H +
C.
[(As 2 S 3 ) m · n H + ·( n - x )HS - ] x+ · x HS -
D.
[(As 2 S 3 ) m · n HS - ·( n - x )H + ] x+ · x H +
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A.
A student at Beijing University.
B.
A teacher at Beijing University.
C.
A teacher at London University.
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A.
a; a
B.
a; an
C.
an, a
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A.
confidentially
B.
proudly
C.
assuredly
D.
confidently
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