题目内容

滚筒采煤机常用的斜切进刀方式有端部斜切进刀和（）两种。

A. 上部斜切进刀
B. 中部斜切进刀
C. 下部斜切进刀

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Internet Protocol videoconferencing (IP/VC) provides which two business benefits? （）

A. Reduced travel time for instructors responsible for different geographic sites
B. Real-time discussions of patient information among remote medical teams
C. Improved morale and reduced turnover among employees who receive timely business updates
D. Increased sales and customer satisfaction due to current product information disseminated simultaneously to a global sales force by headquarter

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