Tail rods are also supplied as standard equipment to serve as position indicators and for emergency opening 尾杆也作为标准配置，用于作为位置指示器，或用于紧急开启用。
2.
Tail rods are also supplied as standard equipment to serve as position indicators and as an emergency means of opening 标准配置包括尾杆，用于指示开关位置并在紧急情况下作为一种开启方法。
