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单项选择题

Photoshop中填充前景色的快捷键是Ctrl+Delete。 A.
正确 B.
错误

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单项选择题蛋白发泡的四个阶段：①干性发泡期 ②起泡期 ③棉花期④ 湿性发泡期，何阶段呈雪白尖峰挺立不下垂（）A. ①B. ②C. ③D. ④

单项选择题10. When the effectiveness of the external market improves, vertical diversification actually shows great limitations, mainly including ( )

A． Relatively bear higher unit production costs
B． Internal asset linking and plan management increase agency costs and control costs
C． Complete internal support or partial internal support, vertical diversification has relatively high operational risks and poor flexibility
D．May reduce technological innovation and resilience
E．Resources are excessively dispersed