An F-60 Fire Guard is inspecting gas cylinders before torch operations begin. Which of the following is an unacceptable condition that requires immediate correction?
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A
Oxygen and acetylene cylinders are stored 10 feet apart.
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B
A wrench is kept on the spindle of the acetylene cylinder valve during use.
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C
The control valve on an oxygen cylinder has oil and grease on it.
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D
Empty cylinders are marked with 'MT' and stored separately from full cylinders.