单选题Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?（）Asignaling that all personnel are clear before lifting or lowering materialBExamining material for sharp edges or protruding points before handlingCClosing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipmentDThrowing materials from high places to the deck
单选题
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
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