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腔背 [qiāng bèi]
back lining
[印刷] hollow
[印刷] hollow
- 书芯的书背可加工成硬背、腔背和柔背等，造型美观、坚固耐用。
Back of the book can be processed into hard back, cavity back and flexible back, shapement and durable. - 分离器还通过回流管与供煤机构出煤处叶片腔相背的一侧叶片腔相联；
Grinding cavity is communicated with separator, which is also connected to one blade cavity on the back of output of coal feeding mechanism. - 本文描述一种六毫米波段注入锁定振荡器。 该振荡器由耿管振荡器、环行器、锁相参考源组成，耿管振荡器采用背腔式稳频和谐振帽电路结构，输出端经环行器与高稳定度锁相源连接。
Presented in this paper are the configuration and performances of a Q-band injection-locked Gunn oscillator with its output connected to a phase-locked reference source by a circulator.
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