Because it plays such a central role in the communication between the upper and lower layers of the Bluetooth protocol stack, the L2CAP layer is a required part of every Bluetooth system.
因为它在蓝牙协议栈的高层和低层通信中起着重要的作用，L2 CAP是每一个蓝牙系统必须的部分。
Stack gas energy restored interlock set plays an important role in FCCU in oil refinery. Long and failure free operation of it can ensure the safety run of FCCU.
烟气能量回收机组在炼油厂催化裂化装置中起着重要作用，机组是否能长周期安全平稳地运行关系到催化裂化装置的安全生产。
The (first) Fresnel zone plays an important role in imaging, it is also used to define the local minimum aperture for the CRS stack.
第一菲涅尔带在成像中起到很重要的作用，其限定了CRS叠加的最小时窗。
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