整体优化原则是城市绿地系统规划的原则之一。
参考答案：对
He _____ the meeting, if he hadn't taken good care of his mom who was sick in hospital then.[ ]
A. will attend
B. had attended
C. would have attended
D. would attend
孕妇尿雌三醇（E3）测定，正常为（）
A.每24小时15mg
B.每24小时12mg
C.每24小时10mg
D.每24小时20mg
E.每24小时8mg
