单项选择题 Task 4 (15 points) 【附件内容同下表】 【要求：将编制的表格写在纸上-拍照-在附件里提交】 Preparing the income statement Use the given Information of ABC company on December 31 of the current year, prepare a multiple-step income statement. (We assume that interest income is exempt from income tax and that the rate of income tax expense is 30%.) Sales 10,500 Sales discounts 500 Inventory, Jan 1 6,000 Purchases 600 Purchase returns and allowances 100 Transportation-in 500 Inventory, Dec. 31 2,000 Advertising expense 500 Depreciation of sales equipment 500 Office salaries 1,000 Depreciation of office equipment 500 Miscellaneous office expenses 500 Interest income 1,000 Rent revenue 1,000

单项选择题 二尖瓣关闭不全的二维超声表现可发现哪项改变：

未知题型 柜体盒饭加热从20度加热到50度需要2小时左右（）