伤感凄凉的爱情诗句:#37.It is fitted with a small transformer,() the voltage of the current can be out ubder control

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#37.It is fitted with a small transformer,() the voltage of the current can be out ubder control
a.in means of which
b.by means of which
c.from means of which
d.under which
选什么,怎么分析的/,中文怎么翻译?

b.by means of which 通过...