单项选择题

100 0 mo1·L-1 NaoH溶液滴定20．00 mL 0．100 0 mol·L-1的HAc至化学计量点时，溶液的pH值是[pKa(HAc)=4．74]( )。
A．5．28
B．9．66
C．4．30
D．8．72

A.00
B.100
C.74](
D.5．28
B．9．66
C．4．30
D．8．72
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In the cross country race; Brown came in 22nd; Williams came in 31st; Jones came in 19th; Samuels came in? What position was Samuels in?
A.26.
B．20.
C．35.
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C．translated
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