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【单选题】
工业品MnCl 2 溶液中含有Cu 2+ 、Pb 2+ 等离子,加入过量难溶电解质MnS,可使Cu 2+ 、Pb 2 + 等离子形成沉淀,以制取纯净MnCl 2 。由此可推知MnS
A.
具有吸附性
B.
溶解度小于CuS、PbS
C.
溶解度与CuS、PbS相同
D.
溶解度大于CuS、PbS
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【单选题】We will pay the commission _____ to you by the end of this month.
A.
due
B.
suitable
C.
forward
D.
regard
【多选题】桑叶、菊花的功效共同点是
A.
疏散风热
B.
平抑肝阳
C.
清肺润燥
D.
清肝明目
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with
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【单选题】烧结普通砖强度评定时,一组试样的数量为( )
A.
5块
B.
10块
C.
15 块
D.
20块