Final answer:The statement is true; acetylene gas fittings have left-hand threads to prevent dangerous mix-ups with other gases during welding operations.Explanation:The statement that left-hand threads are on all fittings for acetylene gas is True.Acetylene gas fittings are designed with left-hand threads as a safety feature. This unique threading prevents the accidental connection of acetylene to fittings for other gases, which could be dangerous. The left-hand threads are easily identifiable and ensure that only compatible equipment is used together. While the acetylene tank provides 9340 L of gas, it's the distinctive threading that is crucial for safety in welding operations, as it avoids the risk of improper connections leading to hazardous situations.Acetylene gas fittings can have either left-hand threads or right-hand threads, depending on the specific application and design. Left-hand threads are commonly used on fittings for acetylene gas because they reduce the risk of accidental connection with other gas types, such as oxygen....

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