Recovery & Recycling第 217 / 240 题
How often must a refillable recovery cylinder undergo a hydrostatic test to remain legal for use?
a.Only once when new
b.Every ten years
c.Every year
d.Every five years
解析
A refillable DOT recovery cylinder must be hydrostatically tested every five years, and the test date is stamped on the cylinder. Using a cylinder past its test date is unsafe and not permitted. Always confirm the test date before filling.
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