长距离输送的链式输送系统应增加张紧装置和链条支撑导轨。
参考答案：对
Peace and development are not only the goals of China, but also the most meaningful direction _____ the whole world should take.
A．which
B．that
C．what
D．in which
物料提升机应按有关规定，（）单位分管负责人负责安装和拆卸。
A、产权
B、使用
C、建设
