机翼防冰按钮“ON”灯何时亮？

防冰活门打开时

按钮开关置于“ON”位时

失效灯灭时

以上都不对

正确答案：B

解析：

机翼防冰按钮“ON”灯何时亮？ A.防冰活门打开时 B.按钮开关置于“ON”位时 C.失效灯灭时 D.以上都不对答案:B 解析：当机翼防冰按钮开关置于“ON”位时，机翼防冰按钮上的“ON”灯会亮起，表示防冰系统已被激活。选项B描述了正确的情况，因此选择B选项是正确的。

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