What are two important considerations when using 2- or 4-channel 15216 OADMs?() All "Add" channels require uniform power levels.。 The flexibility of wavelengths per OADM is limited.。 It is easier to balance "Pass-Through" and "Add" channels.。 There is lower pass-through loss using multi-channel OADMs.。 You can extract a single channel without dropping other channels.。
某患者,女性,55岁。右侧乳房外上象限无痛性肿块。质地较硬,与周围组织分界不清,不易推动,表面有“橘皮样”改变,右侧腋窝可触及多个散在肿大的淋巴结。该患者做哪种检查可确定诊断() CT。 B超。 核素检查。 X线造影。 病理检查。
简述类的字段和属性的区别。
After a number of days set by the parameter CONTROL_FILE_RECORD_KEEP_TIME, the information in the control file is overwritten by RMAN. What is this parameter’s default value?() 1 day。 5 days。 7 days。 31 day。
紧急救护法中首先要学会()和()。
关于儿童多动症,下列描述错误的是()