【单选题】

在某些涡轮螺旋桨驱动的飞机上，状态杆是发动机启动和停车的主要控制装置。在其它类型的飞机上，状态杆主要用来控制设置发动机和螺旋桨速度。

A、On some turbopropeller powered airplanes, the condition lever is the primary control for starting and stopping the enginE. On others, it is the primary control used to set engine and propeller speeD.
B、On some piston powered airplanes, the condition lever is the secondary control for starting and shutting the enginE. On others, it is the secondary control used to set engine and piston speeD.
C、On some turbopropeller powered airplanes, the status lever is the secondary control for starting and shutting the enginE. On others, it is the secondary control used to set engine and propeller speeD.