The number and scope of the levels are well defined: we have four distinct levels; company black box, system black box, logical design inside the system, physical implementation.
I feel anxious whether cannot receive up message because mailing boxsystem either the electric network reason.
我担心是否因为邮箱系统或是网络的原因而未能接收到信息。
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This article takes the system frequency response curves in vented boxsystem as the target, to observe the changes by the effects from the deviation in ts parameters of drivers.