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【单选题】
继电保护执行回路的作用（ ）。A.
测量与被保护电气设备或线路工作状态有关的物理量的变化，如电流、电压等的变化，以确定电力系统是否发生了短路故障或出现不正常运行情况。
B.
当电力系统发生故障时，根据测量回路的输出信号，进行逻辑判断，以确定保护是否应该动作，并向执行元件发出相应的信号。
C.
执行逻辑回路的判断，发出切除故障的跳闸信号或指示不正常运行情况的信号。
D.
以上都是
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【简答题】CPA: closest point of approach
【单选题】The underlined phrase 'inflection point'(Para 1, Line 1)is closest to______.
A.
flash point
B.
turning point
C.
starting point
D.
finishing point
【单选题】The closest point of approach ( CPA ) of a contact on a relative motion radar may be determined ______.
A.
immediately when the contact is noted on radar
B.
only if the radar scope is watched constantly
C.
after the contact has been marked at least twice
D.
by an occasional glance at the radar
【单选题】In radar plotting CPA is the abbreviation of ________ ．
A.
closest point to approach
B.
close point to approach
C.
crossing point to approach
D.
coming point to approach
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