Placarding第 52 / 80 题
When must a four-digit identification number be displayed on or near a placard?
a.Never
b.When required for certain bulk packagings and cargo tanks
c.Only for non-hazardous cargo
d.Only at night
解析
Certain shipments, especially bulk packagings and cargo tanks, must display the material's four-digit ID number on the placard or on an orange panel next to it. This number lets responders identify the exact material. It corresponds to the ID number on the shipping paper.
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