如果曲线弧位于其上任一点的切线上方,则曲线弧是
A. 凹的
B. 凸的
C. 上升的
D. 下降的
休息区的英文翻译
A. Make a Reservation
B. Waiting Room
C. Lounge Bar
D. Menu
安排就座的英文翻译
A. Have sb Seated
B. As Soon...As
C. Follow Me
D. Wait a Moment
客满的英文翻译
A. Be Full
B. As Soon...As
C. Take Your Time
D. Service Charge