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B 开头的英语单词（共 188,305 个）

back-up line

[经] 后备额度, 预备限额

back-up master file

备用主档

back-up memory

[计] 后备存储器, 后援存储器

back-up method

[计] 后援法, 后备法

back-up operation

[计] 后备操作

back-up overspeed governer

附加超速保护装置

back-up overspeed governor

备用超速保安器

back-up path

[计] 后备路径

back-up photomap

背面像片图

back-up post

顶柱

back-up power

[化] 备用电源

back-up process

反回过程

back-up programmer

[计] 后备程序员, 后备编程器

back-up protection

后备保护

back-up protection relaying

后卫保护继电方式

back-up punch

反向凸模

back-up reference station

[计] 后备参考站

back-up register

[计] 后备寄存器

back-up relaying

后备继电保护

back-up ring

支承环

back-up roll

支撑轧辊;支承辊

back-up roll arbor

组合支承辊的心轴

back-up roll bearing

支承辊轴承

back-up roll sleeve

支承辊的辊套

back-up roller

防弯压辊

back-up safety device

后备安全设备

back-up sand

[机] 背砂

back-up shaft

支持辊辊轴

back-up source

后备电源

back-up spring

支承簧