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| || | ||   / _ \\   /  ___||   / _ \\   /_   _// 
| '--' ||  / //\ \\ | // __    | / \ ||  `-| |,-  
| .--. || |  ___  ||| \\_\ ||  | \_/ ||    | ||   
|_|| |_|| |_||  |_|| \____//    \___//     |_||   
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Text this: Manufacturing enterprises' gross margins and performance: A study on the moderating effect of management expenses and R&D expenses