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【单选题】
如图电路,B点接地,电源电压为6V,则A点电位为( )A.
0
B.
6V
C.
-6V
D.
无法确定
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【简答题】世界公认的的五大投资金币为,()的鹰洋金币,中国的()金币,()的克鲁格金币,澳大利亚的()金币以及()的枫叶金币
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