下列除去杂质的方法中,正确的是( ) 选项 物质粉末(括号内为杂质) 去除杂质的方法 A NaCl(NaNO 3 ) 加入适量的AgNO 3 溶液、过滤 B CaCO 3 (Na 2 CO 3 ) 加水、过滤 C Zn(Cu) 加过量H 2 SO 4 溶液、过滤 D H 2 SO 4 (HNO 3 ) 加Ba(NO 3 ) 2 溶液、过滤
A.
A
B.
B
C.
C
D.
D
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【单选题】There is evidence that the usual variety of high blood pressure is, in part, a familial disease. Since families have similar genes as well as similar environments, familial diseases could be due to sh...
A.
because members of the same family tend to used similar amounts of salt
B.
to explore the long-term use of a sodium-based substance
C.
because it was proven that salt caused high blood pressure
D.
because of the availability of chemically pure salt