患者,男,31岁。发热2天,上厕所时昏倒在地,急测血压40/0mmHg,面色苍白,脉搏细速,诊断为流行性出血热休克期,你认为患者产生休克的原因主要是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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