AutoCAD保存文件的快捷键是__________，另存为文件的快捷键是__________。 A: control+s,control+n B: control+s,shift+s C: control+s,control+shift+s D: control+shift+s,control+s

词汇与结构 The ailerons provide roll control around the airplane’s _________ axis. The ailerons are positioned by pilots’ control wheels.

词汇与结构 The elevators provide pitch control around the airplane’s _________ axis. The elevators are positioned by the pilots’ control column.

找命令的快捷键是：（） A: Control（Windows）/Command（MacOS）+C B: Control（Windows）/Command（MacOS）+M C: Control（Windows）/Command（MacOS）+F D: Control（Windows）/Command（MacOS）+S

The visitor is amazed that the bell can control people’s work and rest.

Common fixed costs are not under the direct control of the center’s managers.

The electronic control system mainly contains electronic ignition control, electronic fuel injection control, ABS controls, etc., which respectively improve car’s performance , fuel economy, safety, emission purification and maneuverability．

What are some ways mentioned in this unit to control one’s bad feelings?

The open-loop transfer function of the unity-feedback control system is G(s)=5/(s(s+2)) . When input is the unit-step,the steady-state error is .

The accuracy of scientific observation and calculations is always at the mercy of the scientist's timekeeping methods. A: under the control of B: within the kindness of C: beyond the reach of D: out of the control of