井内的液体经油气分离器进入()被加压举升到地面。
A、单流阀
B、泄油阀
C、保护器
D、多级离心泵
参考答案:D
患者女,26岁,已婚。停经60天, * * 少量流血2天,色鲜红,伴轻度下腹阵发性疼痛。检查宫口闭,子宫大如孕2个月。既往孕2个月流产1次。应考虑诊断为()
A.先兆流产
B.难免流产
C.不全流产
D.稽留流产
E.完全流产
Nobody in the family knows for sure why ________ [ ]
A. it broke out fierce quarrels between the newly wedded couple.
B. the newly wedded couple often broke out fierce quarrels
C. fierce quarrels often broke out between the newly wedded couple
D. fierce quarrels were often broken out between the new wedded couple