在城市污水管道规划工作中，需要确定排水区界、划分排水流域，下列表述中错误的是( )

估算186×21时，186≈190，21≈20，190×20=3800，所以186×21≈3800。[ ]

The third generation network, _____ 3G, provides users with more advanced services. [ ]

A. is known for

B. is known as

C. known for

D. known as

需要层次理论中层次最高的是（）

A.爱与归属的需要

B.自我实现的需要

C.尊重需要

D.生理需要

E.安全需要

His brain was just        anyone’s with so rich experiences.

A．as full of knowledge as

B．full of as knowledge

C．so full of knowledge as

D．full of so much knowledge as

根据《碾压式土石坝施工规范》(DL/T 5129—2001)，在碾压式土石坝的反滤料施工过程中，干密度、颗粒级配、含泥量应每( )m。取样检测1次，且每层至少一次。

A．200～500

B．600～900

C．1000～1300

D．1400～1700