A vessel of less than 20 metres in length or a sailing vessel shall not impede the safe passage of a power-driven vessel following a traffic lane.
帆船或长度小于20米的船舶，不应妨碍按通航分道行驶的机动船的安全通行。
When work is to be interrupted for any length of time, the valve should be closed and all gas released from the hose and regulator to a safe location.
当工作被打断任何长时间时，必须关闭阀门，把软管和调整器内的所有气体排放到安全的地方。
Accurate scale: the stick tube is marked with accurate scale that indicates the safe range for adjustment of stick tube. Do not scale out STOP when adjusting the length of stick tube.
精确标尺：管身表面有精确的标尺，标注管身调整的安全范围，调节管身长度时不能超stop标志。
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