女性,28岁,患甲状腺功能亢进,经抗甲状腺药治疗后症状得到控制,决定外科手术,但唯有心率不下降(105次/分),下列哪一种作术前准备用药较合适()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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