患者,男,20岁,突发四肢紫癜,高出皮肤,对称。伴关节痛及腹痛,化验:WBC10×10⁹/L,Hb112g/L,血小板200×10⁹/L。诊断应该是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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