某女病人因全身关节痛,面有蝶形红斑,查血抗Sm抗体(+),确诊为系统性红斑狼疮,医嘱避免日光直射,病室紫外线消毒时应回避,外出穿长袖上衣及长裤,戴帽或撑伞遮阳,原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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