隔离开关没有专门的灭弧装置，不能断开（）。

纵隔向患侧移位的常见病变是（）

A.肺广泛纤维化

B.胸腔积液

C.一侧气胸

D.胸内巨大肿瘤

E.一侧主支气管不完全性阻塞

在国际经济发展趋势的形式下，确保实现我国经济较快增长的根本之策是( )。

A．刺激和扩大国内需求

B．扩大我国商品出口量

C．扩大国债发行规模

D．扩大吸引外资规模

在( )家庭教养模式下，父母对孩子漠不关心，放任自流，培养出的孩子往往自私，缺乏责任感，并表现出极高的问题行为发生率。

A．疏离型

B．专制型

C．纵容型

D．权威型

E．社会型

设A是实矩阵，证明：

A^TAx=0与Ax=0是同解方程组；

Over the past 50 years, technology has changed the fishing industry dramatically. Today, the romantic, rugged individual fisherman is as threatened a species as the cod and tuna that once swarmed into his nets. This is the cumulative result of more sophisticated fishing gear, more powerful boat engines and a lack of regard for local fishing environments by the multinational enterprises that have come to dominate this business. There are about 30 million professional fishermen worldwide, but 50 percent of the fish caught at sea are captured by only 1 percent of the boats, notes Xavier Pastor, European vice-president for Oceans, a non-profit international advocacy group for the world’s oceans. "Industrialized fishing is leading to the disappearance of the small fisherman," he observes, with concomitant damage to both fish stock and to local economies and social structures. "Some fleets are just too big," Pastor says. "They are very efficient at taking the last fish in an area, then they move on to something else." This transformation has led to a global fishing crisis that is endangering most of the planet’s commercial stocks. Oceans reports that industrial fishing worldwide yields between 80 million and 100 million tons of fish, but it also generates 27 million tons of discards (marine organisms thrown back into the water after they have been caught), causing negative effects on the ecosystem that will last for decades. According to the Fond and Agricultural Organization, the commercial productivity of the oceans is at an all-time low, with 75 percent to 80 percent of the world’s major fisheries overexploited, fully exploited or recovering from depletion. "We are not anti-fishing," emphasizes Pastor. "Fishing is important. We Want to make sure that future generations can do the same."