Inspection第 42 / 60 题
Inspecting the coupling system on a tank trailer is important because:
a.It changes the color of the placards
b.It sets the cargo temperature
c.It has nothing to do with safety
d.A failed coupling could allow a heavy loaded tank to separate from the tractor
解析
The coupling system, including the fifth wheel and kingpin, must be secure and undamaged. With the heavy weight of a loaded tank, a coupling failure could let the trailer break away with catastrophic results. Carefully checking the coupling is essential before pulling a tank trailer.
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