Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?（）<br>A:signaling that all personnel are clear before lifting or lowering material<br>B:Examining material for sharp edges or protruding points before handling<br>C:Closing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipment<br>D:Throwing materials from high places to the deck

Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?（）
A:signaling that all personnel are clear before lifting or lowering material
B:Examining material for sharp edges or protruding points before handling
C:Closing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipment
D:Throwing materials from high places to the deck

出自：海船船员证

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