第16题: [单项选择]关于月经周期中宫颈黏液的变化下列何项是错误的()。 A. 雌激素使宫颈黏液分泌量增多,稀薄而透明 B. 孕激素使宫颈黏液分泌量减少,但伸展性增强 C. 雌激素使宫颈黏液拉丝度在10cm以上 D. 孕激素使宫颈黏液中结晶逐渐模糊 E. 排卵期雌激素对宫颈分泌物的影响达高峰 参考答案:B
第25题: [单项选择]Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and()refers to call issues that cause variations in timing or time of arrival. A. echo B. jitter C. packet loss D. digitized sampling 参考答案:B