A—assembly line J—safety boots B—packer K—shipping clerk C—forklift L—time card D—explosive materials M—warehouse E—fire extinguisher N—hard hat F—loading dock O—earplug G—machine operator P—hand truck H—electrical hazard Q—safety earmuffs I—conveyor belt Examples: (F)装载码头 (K) 51.( )易爆材料 ( )安全耳罩 52.( )]二 ( )安全靴 53.( )装配线 ( )灭火器 54.( )安全帽 ( )手推车 55.( )机器操作员 ( )输送带