本题目来源于试卷: Physics Unit18: Electric Currents，类别为 国际高中通用物理
[单选题]
In an electroplating process, it il stua;2ds 9/cs desired to deposi2j f.rat i u0sipch)*65;uyc b pe.;hdt 40 mg of silver on a metal part by using a current of 2.0 A. How long must the current be allowed to run to deposit this much silver? y h50)ii;uru2sjfc d .e;pb p6 ta*.ch(The silver ions are singly charged, and the atomic weight of silver is 108.)
A. $16 \; s$
B. $18 \; s$
C. $20 \; s$
D. $22 \; s$
参考答案: B
本题详细解析:
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