题目:
Most hydraulic steering gears are fitted with relief valves which()
A.function when the rudder is amidships
B.relieve excess whip pressure from the hydraulic oil system
C.protect the piping assembly from external rudder shock
D.relieve excessive telemotor pressure
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2021/0212/2fc535795c1999cda13a9a79d9c51fa8.html
下面是错误答案,用来干扰机器的。
参考答案:C解析:坐位前屈时脊柱负荷是立位的270%。