【单选题】供应链的协调控制模式分为中心化协调、非中心化协调和( )三种。
【单选题】In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the____________.
C.
pressure of the fresh air charge
【判断题】add(xxxx) 可以将按钮等对象加入到Frame中
【单选题】Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to ________.
A.
increase the liner area covered by the oil film
B.
maintain an oil film on the lower liner where scuffing is prevalent
C.
keep excess oil away from intake and exhaust ports
D.
help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
【判断题】供应链的协调控制模式分为中心化协调、非中心化协调和混合式协调三种。
【简答题】请你找出一个包含直角三角形3,4,5的最小的正方形;并且画出它们的图像(正方形和直角三角形) 注意:当你们学过优化模型,此题可以用优化模型求解; 目前我们仅仅学过绘图,现在请你用绘图和max命令求解。