如图所示的电路中,若要使两灯组成串联电路,只需闭合开关______。

如图所示的电路中,若要使两灯组成串联电路,只需闭合开关______。若开关S1、S3闭合,S2断开,两灯组成______电路。 若同时闭合三个开关,电路会形成___________,这是不允许的。

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