[多选] What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)

A . All "Add" channels require uniform power levels.
B . The flexibility of wavelengths per OADM is limited.
C . It is easier to balance "Pass-Through" and "Add" channels.
D . There is lower pass-through loss using multi-channel OADMs.
E . You can extract a single channel without dropping other channels.

教师在教育教学活动中对学生各种表现，特别是对意外情况和偶发事件，能够及时作出灵敏的反应，并采取恰当措施和解决问题的特殊能力是指教师的（）教学效能感。教育机智。教学监控能力。教学反思。结构化程序设计的主要特征与风格是什么？社会学学科的本质特征是（）现实性。实证性。开放性。整体性。 Which background process is responsible for writing the dirty buffers from the write list to the data files during a checkpoint？（） CKPT。 SMON。 LGWR。 DBWn。 ARC。 When would the Cisco Supervisor Desktop fail to show an agent that is logged in? （） The agent is not ready. 。 The agent is not on a call. 。 The agent is an IP phone agent. 。 The agent is not in the team currently being viewed by the supervisor.&e。 What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)

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[多选] What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)

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