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【单选题】
酸碱指示剂的理论变色范围是( )
A.
pH = pK HIn + 1
B.
pH = pK HIn - 1
C.
pH = pK HIn ±1
D.
pH = pK HIn
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举一反三
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【单选题】Lots of rescue workers were working around the clock, _____ supplies to Yushu, Qinghai province after the earthquake. [     ]
A.
sending
B.
to send
C.
having sent
D.
to have sent
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