哪些是输卵管结扎术后可并发异位妊娠的原因
A.绝育术时已受精
B.与结扎方式有关
C.双扎切断法易并发异位妊娠
D.保留输卵管过长
E.术后感染
参考答案:A,B,C
The president's speech was ______ boring; it is, in fact, rather inspiring and interesting. [ ]
A. anything but
B. nothing
C. no more but
D. all but
周时的滕嫁制度是为了尽可能的巩固周围在各分封国的势力。