On April 23, the management department of growth enterprise market company of Shenzhen stock exchange sent an inquiry letter to Shanghai Huahongjitong Smart System Co.Ltd(300330) the annual report, requiring that, in combination with the company's operation during the reporting period, the company's performance fluctuated greatly in each quarter, the operating revenue increased significantly in the second and fourth quarters, the net profit in the third quarter was negative, and the reason and rationality of the sharp year-on-year increase in the net profit in the fourth quarter; Explain whether the net cash flow from operating activities in the reporting period was negative in the first three quarters and the reason for the significant increase from the fourth quarter matched with the change of net profit in the same period.
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