What is TRUE of the history display of a target’s past positions on an ARPA?（）
A. It provides a graphic display to emphasize which vessel is on a collision course
B. In the true presentation，it provides a quick visual check to determine if a vessel has changed course
C. The display is one of the primary inputs and must be in use when using the trial maneuver capability
D. It provides a graphic display of a target vessel's relative course，speed，and CPA
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颊部的解剖界线是：上界为_________，下界为_________，前界至_________，后界达_______。
卖方备货、组织货源，同时进行报关、保险、取证等活动所处的交易阶段是（）。
A. 交易前推备
B. 交易磋商
C. 签订合同
D. 履行合同和索赔
工资集体协商是维护职工劳动经济权益的有效途径。请问：什么是工资集体协商？
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