531 蓝脆性 blue shortness

532 材料表 BM (= bill of material)

533 定倾半径 BM (= matecentric radius)

534 模宽,型宽 B (= breadth) moulded (Bmld)

535 板呎(木材) board feet (or foot) measure (BMF)

536 船侧走道(水翼船) boardwalks

537 船,小艇 boat

538 小艇布置 boat arrangement

539 小艇滑车 boat block

540 小艇座 boat chock

541 小艇罗经 boat compass

542 小艇盖 boat cover

543 桨架 boat crutch (or rowlock)

544 小艇吊架 boat davit

545 小艇甲板 boat deck

546 小艇甲板灯 boat deck lamp

547 小艇吊杆 boat derrick

548 小艇装备 boat equipment

549 小艇吊索 boat fall

550 [小]艇[装]具 boat fittings

551 [小]艇[装]具 boat gear

552 小艇扣带 boat gripe

553 小艇吊放装置 boat handling gear

554 小艇吊杆 boat hoist

555 小艇吊机 boat hoisting engine

556 艇钩 boat hook

557 小艇灯 boat lamp (or light)

558 小艇下水装置 boat launching arrangement

559 艇底[泄水]塞 boat plug

560 飞艇 boat seaplane (or flying boat)