第二产程延长是指经产妇超过2小时，初产妇超过1小时尚未分娩。
参考答案：错
— How many students, do you think, will be present at the meeting?
— I expect _____ 200 students. [ ]
A. there being
B. there been
C. there be
D. there to be
在项目评估阶段，投资估算的精度要求是在士( )左右。
A．20%
B．30%
C．50%
D．10%
