因为级别的数量仍然保持一致而不用管地图的现实范围，地图瓦片可以被浏览器在多级别的情况下进行缓存。
Since the number of levels remains the same regardless of the map extent, map tiles can be cached by the browser in multiple levels.
行波管多级降压收集极是将废电子注按照速度分类收集的装置。
Multistage depressed collector of Traveling wave tube is the device used for collecting spent beam according to their speed.
采用多级降压收集极（MDC）是提高行波管效率的重要方法。
The multistage depressed collector (MDC) is an important method of improving the TWT efficiency.
采用锥角过度节流油嘴设计、多级节流油嘴降压设计和多路放喷管汇设计，达到延长管汇寿命保证安全生产之目的。
Improvement program use of cone Angle chokes; multi-nozzle chokes and multiple exchange design to extend manifold service life to ensure safety.
效率：一个激光二极管是一种单级设备，使其具有内在的效率比多级设备。
Efficiency: a laser diode is a single-stage device so it is inherently more efficient than a multistage device.
设置了多级喷嘴和锥管以产生多重引射自吸式内外混合。
The multiple jets and taper pipes are set for production of multiple induced jet, self-absorption type outer-inner mix.
设置了多级喷嘴和锥管以产生多重引射自吸式内外混合。
The multiple jets and taper pipes are set for production of multiple induced jet, self-absorption type outer-inner mix.
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