Filling the tank, waiting for the expansion tank to fill, and then topping off the filler neck is improper fueling procedure .
给油箱加油时，等待膨胀箱加满和把燃油加到加油口处的作法是不正确的。
The direct cause of this bearing 'failure was its improper assembly caused by improper maintenance procedure, and the root cause was too small internal radial clearance after mounting.
而非驱动端轴承损坏的直接原因是由于检修程序不完善使轴承在大修中安装不当所造成的，其根本原因则是轴承安装后游隙过小。
The improper processing procedure also promoted the shaft broken.
加工残留刀痕对轴的横向断裂起了促进作用。
The improper processing procedure also promoted the shaft broken.
加工残留刀痕对轴的横向断裂起了促进作用。
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