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胎儿缺氧早期表现为胎心率( )。


A.
胎心率>180次/分,胎动增加

B.
胎心率>160次/分,胎动增加

C.
胎心率>140次/分,胎动增加

D.
胎心率<120次/分,胎动减少

E.
胎心率<100次/分,胎动减少
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