患者,女性,35岁。被从15m高处落下的石块击中头顶,神志清楚,主述头皮疼痛。查体:颅顶有一约6cm头皮裂伤。为明确诊断,首选的辅助检查是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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