This is ___ useful dictionary .选择：A.an B.a C.the D./
人气：300 ℃ 时间：2019-10-09 14:02:18
解答
A.an
用an
The aluminium is an useful kind of metal.
铝是一种有用的金属.
To establish an useful method for sampling and detecting glutaral in the workplace.
建立一种实用的工作场所空气中戊二醛的采样、测定方法.
希望能采纳,谢谢
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