真空试验
对压入轴承套的内孔进行加工时,其尺寸应按修复后的轴直径留出间隙,其间隙值等于0.001~()倍的轴径。 ["A、0.0011","B、0.0012","C、0.0013","D、0.0014"]
团体旅客乘坐火车旅行,必须在开车()小时以前办理退票手续。 ["A、2","B、12","C、24","D、48"]
通常简单型输入输出扩展机是通过()与主机通信的。 ["并行接口","串行接口","8255","8259"]
冰雪地或水面会反射很强的太阳光,在此环境里数小时,即可造成雪盲,此时需要()。 ["应以眼药水洗清眼睛,","到黑暗处或以眼罩蒙住眼睛,","减少用眼,尽量休息,","用热毛巾热敷。"]
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