【判断题】直接金融服务产品主要包括股票,公司债券,银行债券等( )
【简答题】自然循环常见故障有哪些?提高自然循环安全性的措施有哪些?
【判断题】The statement of cash flows should be reviewed for several time periods in order to determine the major sources of cash and the major uses of cash.
【简答题】常见的水循环故障有哪些?自然循环热水锅炉有哪些措施预防循环故障?