在水质分析中,测定水的硬度通常用配位滴定法测定()
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The young man was seriously hurt in the accident and the doctors' efforts to revive him were ____.
A. futile
B. fulfill
He is ___ for her work with cancer patients.
A. esteemed
B. esteem
Despite the heavy rain,everyone was assembled at the ___time .
A. appointment
B. appointed
This passage mainly tells us a ___life of a man .
A. tragedy
B. tragical
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