某建设项目，当=25%时，其净现值为200万元;当=30%时，其净现值为一60万元该

消费者监督权：是指消费者享有对商品和服务以及保护消费者权益的工作进行监督的权利。根据上述定义，下列行为属于行使消费者监督权范围的是( )

A．小赵在商店中专门购买假冒伪劣商品以获取赔偿

B．一家烤鸡店为战胜对手，向消费者称对手的货源不合格

C．小张发现某商场的电梯存在安全隐患，立即报告给有关部门

D．老王在一家商店买回了变质的食品，马上回去要求退换

如图所示，在绳下端挂一物体，用力F拉物体使悬线偏离竖直方向的夹角为α，且保持平衡，若保持α角不变，当拉力F与水平方向的夹角β为多大时，F有极小值（　　）

A．β=0

B．β=

C．β=α

D．β=2α

计量属性

Tragedies have a way of making people rethink their (1) and find a new focus. They make people think about what a society needs in order to (2) . The notion of doing something to take control of society or of our fate as humans might be dated back to ancient times of the (3) . Now, in the early 21st century, " social (4) " are trying to take back some (5) over society’s direction once again. A social inventor is not necessarily a social (6) , a social (7) or someone who works in a (8) industry or invents new (9) and consumer products. A social inventor is using the power of (10) thinking, to come up with ideas for (11) in certain communities or sections of society. They have a vision of a (12) world and create new systems or practices. Their ideas may seem (13) or impossible. They are usually quite (14) people. But some of these creative thinkers have (15) and quietly changed the way we live. Social inventions do not have to be (16) . Sometimes they are new (17) for neighborhoods or communities, or even very (18) ideas. The idea of social inventions has become so popular in recent years. It shows how much people desire to make a (19) in our society and not remain (20) .

Tragedies have a way of making people rethink their (1) and find a new focus. They make people think about what a society needs in order to (2) . The notion of doing something to take control of society or of our fate as humans might be dated back to ancient times of the (3) . Now, in the early 21st century, " social (4) " are trying to take back some (5) over society’s direction once again. A social inventor is not necessarily a social (6) , a social (7) or someone who works in a (8) industry or invents new (9) and consumer products. A social inventor is using the power of (10) thinking, to come up with ideas for (11) in certain communities or sections of society. They have a vision of a (12) world and create new systems or practices. Their ideas may seem (13) or impossible. They are usually quite (14) people. But some of these creative thinkers have (15) and quietly changed the way we live. Social inventions do not have to be (16) . Sometimes they are new (17) for neighborhoods or communities, or even very (18) ideas. The idea of social inventions has become so popular in recent years. It shows how much people desire to make a (19) in our society and not remain (20) .

毛 * * 在总结中国新民主主义革命胜利的经验时曾说：“我们有许多宝贵的经验。一个有纪律的，有马克思列宁主义的理论武装的，采取自我批评方法的，联系人民群众的党。一个有这样的党领导的军队。”下列能够为上述经验提供实践依据的是（）

A.北伐战争、南昌起义、一届人大

B.武昌起义、五四运动、抗日战争

C.中共一大、遵义会议、十一届三中全会

D.南昌起义、遵义会议、三大战役