建构主义学习观中，教师的角色是( )。A．学习的决策者 B．学生的合作者 C．学习的

新建、扩建工程及技改工程投产前负责部门应按整定范围按规定格式（）向负责保护定值计算的部门提出定值申请。

A.书面

B.生产系统

C.电子文档

D.以上均不正确

灌注桩后注浆技术中，关于注浆作业的顺序描述中正确的是（）

A.对于非饱和土的复式注浆顺序宜先桩侧，后桩底。

B.对于饱和土的复式注浆顺序宜先桩侧，后桩底。

C.多断面桩侧注浆宜先下后上。

D.对于桩群注浆宜先内部，后外围。

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.

A．same

B．similar

C．different

D．difference

目前我国重载运输线路的轨枕主要使用（）枕。

一般生产（）类型产品时，才在D301的采样点AC9采样分析数据。