液氮管路活接头必须具有空间尺寸小、安装拆卸方便、使用周期长的特点。
The liquid nitrogen union must have several advantages, such as small volume, easy to assemble and disassemble, long life, etc.
卷烟厂中央空调系统具有风量大、能耗高、制冷机组全年运行周期长的特点。
With a huge supply air and long running time, the energy consumption of central air-conditioning system of tobacco factory is much more than other central air-conditioning system.
针对P码多普勒频移大、周期长的特点，本文探讨了缩短载频搜索范围的方法。
According to P-code features of large Doppler frequency shift and long code period, the method that shortens the scope of carrier frequency search is studied.
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