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举一反三
【单选题】第二篇 Sleep We all know that the normal human daily cycle of activity is of some 7 - 8 hours’ sleep alternating with some 16 - 17 hours’ wakefulness and that, broadly speaking, the sleep n...
A.
people hate the inconvenience of working on night shifts.
B.
your life is disturbed by changing from day to night routines and back.
C.
not all industries work at the same hours.
D.
it is difficult to find a corps of good night workers.
【多选题】配电终端供电电源采用直流电源供电时技术参数指标应满足（）。
A.
电压标称值为110V、48V或24V
B.
标称电压容差为+15%～.20%
C.
电压纹波不大于5%
D.
电源谐波含量小于5%
【单选题】IPPBX设备应支持终端订阅功能，可以向CM-IMS网络发起订阅流程，并支持接收CM-IMS网络发来的（）消息。
A.
option
B.
notify
C.
SIP
D.
register