成员的完整列表，这些成员属于 roboctrl::ctrl::power_wheel,包括所有继承而来的类成员

angular_speed (定义于 roboctrl::ctrl::power_wheel)	roboctrl::ctrl::power_wheel
max_current (定义于 roboctrl::ctrl::power_wheel)	roboctrl::ctrl::power_wheel
measured_current (定义于 roboctrl::ctrl::power_wheel)	roboctrl::ctrl::power_wheel
online (定义于 roboctrl::ctrl::power_wheel)	roboctrl::ctrl::power_wheel
requested_current (定义于 roboctrl::ctrl::power_wheel)	roboctrl::ctrl::power_wheel
target_angular_speed (定义于 roboctrl::ctrl::power_wheel)	roboctrl::ctrl::power_wheel