如图所示是一个水位自动报警器的原理图ab是两个�属块在水位达到�属块b时 A.红灯亮 b.绿灯亮 c.两灯都亮 d.两灯都不变 Template




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tomski如图所示是一个水位自动报警器的原理图ab是两个�属块在水位达到�属块b时 a.红灯亮 b.绿灯亮 coloring