中海达：公司的销售费用和管理费用占营业成本的比例因季度业务进展情况而有所动态变化

Group 1 - The company stated that its sales and management expenses as a percentage of operating costs fluctuate based on quarterly business progress [1] - Investors are encouraged to compare these expenses with historical quarterly data found in the company's annual report for a comprehensive analysis [1]