问题 更新时间2023/4/3 12:59:00 】He cleaned the old machine and ________ the moving parts with a little mineral oil, hoping that it could work again.A、lubricationB、lubricantC、lubricatedD、lubricator 答案 登录 注册 正确答案: C 出自:超星 >> 河北农业大学大学英语Ⅳ