有一整定阻抗幅值为 8 Ω、最大灵敏角为 60 °的方向圆阻抗继电器,当测量阻抗的幅值为 4 Ω,阻抗角为 30 °时,该继电器处于 ______ 状态。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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