卵巢黏液性囊腺瘤()。
A.发生于体腔上皮
B.发生于生殖细胞,偶向单一胚层分化
C.发生于腹膜上皮
D.转移而来
E.有梅格斯综合征
参考答案:A
电机车运输的红色灯信号是()。
A、停车
B、正常行驶
C、慢速行驶
What these young men were doing()a threat to the safety of the whole neighborhood.
A.constructed
B.contracted
C.constituted
D.contributed