患者,男性,60岁,慢性心力衰竭。医嘱:25%葡萄糖注射液20mL+毛花苷C 0.4mg,iv。护士注射中发现局部肿胀、疼痛,抽有回血,其可能的原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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