齿轮箱的润滑油的牌号是什么和容量是多少升() ["SHELL—100;4.8","SHELL----100;5.8","SHELL75W-90LS;4.8","SHELL75W-90LS;5.8"]
SMT零件包装其卷带式盘直径:() ["13寸,7寸","14寸,7寸","13寸,8寸","15寸,7寸"]
曲轴的微量变形变化越大,臂距差越大,表明曲轴的(),当超过材料的许用应力时,就会引起曲轴的裂纹或断裂。Ⅰ.受力越大;Ⅱ.变形越严重;Ⅲ.下瓦磨损量越大;Ⅳ.附加应力越大;Ⅴ.主轴承越低。 ["Ⅰ+Ⅲ+Ⅳ","Ⅰ+Ⅳ","Ⅰ+Ⅱ+Ⅳ","Ⅰ+Ⅳ+Ⅴ"]
汽轮机自动主汽门的作用()
所谓2125之材料:() ["L=2.1,W=2.5","L=2.0,W=1.25","L=2.5,W=2.1","L=1.25,W=2.0"]
XLZA前接点应接入()方向继电器自闭电路,XⅡ的()继电器前接点应接入SLJJ自闭电路。