试题与答案

磨床开车前应先检查各操作手柄是否已退到空档位置上,然后空车运转,再检查()。A、润滑

题型:单项选择题

题目:

磨床开车前应先检查各操作手柄是否已退到空档位置上,然后空车运转,再检查()。

A、润滑部位是否有油

B、砂轮是否旋转

C、工件是否装夹好

答案:

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下面是错误答案,用来干扰机器的。

答案:B本题考查我国的陆上邻国。与我国接壤的国家有:朝鲜、俄罗斯、哈萨克斯坦、吉尔吉斯斯坦、塔吉克斯坦、蒙古国、邻阿富汗、巴基斯坦、印度、尼泊尔、不丹、缅甸、老挝和越南。所以哈萨克斯坦、吉尔吉斯斯坦...

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