公安科技群众化是积极推广适用于民间的公安科技，提高群众自防、自救能力；在群众中普及防卫知识，提高群众防范违法犯罪活动的本领。( )
参考答案：对
The monument was built in honor of the explorer who was believed _____ the river.
A．to have discovered
B．to have been discovered
C．to discover
D．having been discovered
影响建设工程投资的是( )阶段。
A．方案设计 B．初步设计 C．技术设计 D．施工图设计
