高频加强滤波器可以有效增强图像边缘和灰度平滑区的对比度。
参考答案：对
When they retire, many people over 60 prefer the houses in the country to spend their remaining years to __________ in a large city.
A．it
B．that
C．those
D．which
患者，女，25岁，G1P0，足月妊娠，胎膜早破，自然分娩后第3天，体温38.8℃，下腹疼，恶露血性混浊有臭味，宫底平脐，压痛，白细胞15.8×109/L，中性粒细胞80%，最可能的诊断是
A．急性输卵管炎B．急性子宫内膜炎及子宫肌炎C．急性子宫颈炎D．急性盆腔腹膜炎E．败血症
