SELCAL SELective CALl 选择性呼叫 SEMF Synchronous Equipment Management Function 同步设备管理功能 SENET Slot Envelope NETwork 时隙包络网 ..
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数字选择性呼叫 digital selective calling ; DSC ; VHF DSC
数字选择性呼叫设备 digital selective call equipment
选择性呼叫前转 Selective Call Forwarding
选择性呼叫拒绝 Selective Call Rejection
甚高频数字选择性呼叫 VHF DSC
着重阐述了利用数字选择性呼叫技术的船舶跟踪系统的组成结构及其工作原理、技术指标；
Next, the structure, the working principles and the performance of the DSC Ship Tracking System which has been developed by the author is mainly described.
(甚高频数字选择性呼叫)作为近海海域的一种主要报警方式，对于船舶航行安全有着很重要的作用。
VHP DSC (very High Frequency Digital Selective Call), as a main means of alarm, is very important for the vessels to navigate safely.
您可以将程序参数指定为选择性的，以便在程序码呼叫程序时，呼叫程序码不必提供引数给它。
You can specify that a procedure parameter is optional, so that the calling code does not have to supply an argument for it when it calls the procedure.
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