The process of inclinedriving safe drop test of a coal mine and is presented point out the problems in which should be paid attention to.
介绍了煤矿斜井人行车防坠试验的过程，指出了试验中应注意的问题。
2
When driving in the mountains, have you ever noticed a discrepancy between the slope described on the yellow road sign and your sense that the incline is actually much steeper?