为了响应国家工业和信心产业部[2009]666号文件我国数字对讲机实现模拟转数字化的要求,并且为了方便企业生产和调试、降低成本的目的。采用国产基带芯片SCT3918设计了一款适应我国国情的数字对讲机CDMR(ChinaDigital Mobile Radio),在...为了响应国家工业和信心产业部[2009]666号文件我国数字对讲机实现模拟转数字化的要求,并且为了方便企业生产和调试、降低成本的目的。采用国产基带芯片SCT3918设计了一款适应我国国情的数字对讲机CDMR(ChinaDigital Mobile Radio),在实验室内做了射频技术指标测试、音频技术指标测试、可靠性测试,实验结果表明射频技术指标符合[2009]666号文件要求,音频技术指标符合《移动通信调频无线电话机通用技术条件》,设计符合我国对讲机模拟转数字的政策、适合我国的国情、便于企业生产和调试。展开更多
In recent years, the cesarean section rate has been high. Because of the lack of research on cesarean section without medical indication, the surgery is facing huge risks. To compensate for the lack of domestic-relate...In recent years, the cesarean section rate has been high. Because of the lack of research on cesarean section without medical indication, the surgery is facing huge risks. To compensate for the lack of domestic-related research, and help clinicians to weigh the pros and cons of cesarean section, the paper reviews the reasons for cesarean delivery on maternal request （CDMR） and the advantages and disadvantages of CDMR so as to put forward constructive advice.展开更多
文摘为了响应国家工业和信心产业部[2009]666号文件我国数字对讲机实现模拟转数字化的要求,并且为了方便企业生产和调试、降低成本的目的。采用国产基带芯片SCT3918设计了一款适应我国国情的数字对讲机CDMR(ChinaDigital Mobile Radio),在实验室内做了射频技术指标测试、音频技术指标测试、可靠性测试,实验结果表明射频技术指标符合[2009]666号文件要求,音频技术指标符合《移动通信调频无线电话机通用技术条件》,设计符合我国对讲机模拟转数字的政策、适合我国的国情、便于企业生产和调试。
文摘In recent years, the cesarean section rate has been high. Because of the lack of research on cesarean section without medical indication, the surgery is facing huge risks. To compensate for the lack of domestic-related research, and help clinicians to weigh the pros and cons of cesarean section, the paper reviews the reasons for cesarean delivery on maternal request （CDMR） and the advantages and disadvantages of CDMR so as to put forward constructive advice.
