通常ZL50铲运机采用的是何种行车制动系统？
参考答案：
ZL50装载机采用的是气液综合式行车制动系，它由双管路气压系统和双管路液压系统组成。由空气压缩机产生的压缩空气经油水分离器后，进入两储气筒。两储气筒相互独立。双腔制动阀由制动踏板直接操纵。踩下制动踏板，两储气筒中的压缩空气分别经双腔制动阀的上.下腔充入各自的助力器，使压力油推动前.后轮制动器的分泵活塞，使车轮制动。放松制动踏板时，助力器的空气经制动阀排入大气，制动接触。
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| John was the only son of a rich American businessman. Usually he _1 to school by the driver 2 his father's beautiful car before the driyer took John's father to his office. One evening his father told him that he had to go to the airport early 3 , 4 he would need the car at the time that John had to go to school. 5 John's mother had another car, she would still be 6 when he 7 the house. "Well, how will I get to school if you need your car and Mummy is still in bed?"John asked. His father thought this was a good opportunity (机会) to teach him a lesson about how hard 8 for many people of the world, so he answered, "You'll go in the same way 9 every 10 child in the word goes-on a bus. " | ||||
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