单项选择题 Which one of the following would occur if the purchase of computer stationary was debited to the computer equipment at cost account? A、An overstatement of profit and an overstatement of non-current assets B、An understatement of profit and an overstatement of non-current assets C、An overstatement of profit and an understatement of non-current assets D、An understatement of profit and an understatement of non-current assets

单项选择题 带电的电气设备失火，灭火可能带来最大的危害是什么？

多项选择题 掘进工作面有()情形之一进行作业者，视为空顶作业。