初产妇,26岁,足月临产,宫缩具有正常的节律性、对称性和极性,但宫缩30s/5~10min,产程进展缓慢,胎心音135/min。应首先考虑为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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