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【单选题】
下列原电池的符号,书写正确的是
A.
(-)Zn(s)|Zn 2+ (c)||Cu 2+ (c)|Cu(s)(+)
B.
(-)Zn 2+ (c) | Zn(s) ||Cu 2+ (c)|Cu(s)(+)
C.
(-)Zn 2+ (c) | Zn(s) || Cu(s) | Cu 2+ (c) (+)
D.
(-)Zn(s)|Zn 2+ (c)|| Cu(s) | Cu 2+ (c) (+)
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双因素理论
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【单选题】有一换热设备,准备在其外面包以两层保温材料.要达到良好的保温效果,应将导热系数较小的保温包在( )层.
A.
外层
B.
内层
C.
外层或内层
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