如图甲所示把玻璃珠接入电路中闭合开关�现小灯泡不�光.这说明通常情况下玻璃珠是绝缘体若给玻璃珠加热如图乙所示当玻璃珠加热到红炽 Template




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tomski如图甲所示把玻璃珠接入电路中闭合开关�现小灯泡不�光.这说明通常情况下玻璃珠是绝缘体若给玻璃珠加热如图乙所示当玻璃珠加热到红炽 coloring