呈不规则圆柱形、半圆柱形或块状,常屈曲不直,结节状,形如猪大肠,表面淡灰黄色,弯曲处常有深陷的横沟而呈结节状的瘤块样的是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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