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【单选题】
采用Na2S作显色剂检查重金属的条件是( )A.
弱酸性
B.
碱性
C.
中性
D.
强酸性
E.
以上均可
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A.
陈氏、杨氏、吴氏
B.
陈氏、杨氏、武氏、孙氏、吴氏
C.
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【单选题】The reason why he rejected our plan is ______ he didn ’ t trust us.
A.
for
B.
because
C.
since
D.
that
【简答题】The
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