单项选择题
A. the DCC-E
B. the DCC-M
C. the DCC-R
D. the Line DCC
E. the Section DCC
单项选择题 SDHCodeViolations（CVs）totalsinthePMtablesareactuallyanaccumulationofthenumberof（）.
多项选择题 Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications. What are two possible sources of trouble shown in the system？（）
多项选择题 Whataretwoimportantconsiderationswhenusing2-or4-channel15216OADMs？（）