多项选择题
A.A
B.B
C.C
D.D
E.E
单项选择题 Which command generates a BERT test pattern of all zeros on T1 number 1 for ten minutes?（）
单项选择题 Which command generates a BERT test pattern of alternating ones and zeros on T1 number 1 for one minute?（）
单项选择题 Which command displays the results of a loopback test you executed on a CT3 line module in slot 5, port 0, t1 number 4?（）
