女性,30岁,有月经过多史1年,HGB80g/L,WBC8.0×109/L,PLT180×109/L,网织红细胞0.015,血涂片可见红细胞中心淡染区扩大,下列对辅助诊断没有意义的是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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