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【单选题】
下列化合物中,哪一个pKa值最小?
A.
乙酰乙酸乙酯
B.
丙酮
C.
乙醇
D.
乙酸乙酯
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join
B.
join in
C.
join up
D.
join to
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A.
join
B.
join in
C.
join to
D.
join for
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【单选题】正弦交流电的频率为100 Hz,则它的周期为( )。
A.
0.02s
B.
0.01s
C.
0.4s
D.
0.2s
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