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当前学科:煤气输送工初级
题目:
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德尔格CO检测仪每隔10秒左右发光二极管闪烁一次,说明()。
A . A.仪器工作正常;
B . B.电源电压下降;
C . C.仪器工作不正常;
D . D.电路循环自检不正常。
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