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在磁场空间分别取两个闭合回路，若两个回路各自包围载流导线的根数不同，但电流的代数和相同．则磁感应强度沿各闭合回路的线积分______． (填： 相同、不相同)

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单项选择题
Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves the opposite problem－how to collect body heat. They have designed a collection system which utilizes not only body heat, but the heat given off by such objects as light bulbs and refrigerators as well. The system works so well that no conventional fuel is needed to make the campus's six buildings comfortable.
Some parts of most modern buildings－theaters and offices as well as classrooms are more than amply heated by people and lights and sometimes must be air-conditioned even in winter. The technique of saving heat and redistributing it is called “heat recovery.” A few modern buildings recover heat, but the University's system is the first to recover heat from some buildings and reuse it in others.
Along the way, pit has learned a great deal about some of its heat producers. The harder a student studies, the more heat his body gives off. Male students emit more heat than female students, and the larger a student, the more heat the produces. It is tempting to conclude that the hottest prospect for the Johnstown campus would be a hardworking, overweight male genius.
The phrase “even in winter”（in line 8）most nearly means ____.（　　
A.ifthewinterisespecially
B.duringalloftheyearexceptthewinter
C.inthewinteraswellasinotherseasons
D.duringtheeveningsinthewinter
单项选择题
《生活饮用水卫生标准》(GB5749-2006)中锰的含量高限是( )mg/L。
A.0.3
B.0.1
C.1.0
D.0.2
单项选择题
Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves the opposite problem－how to collect body heat. They have designed a collection system which utilizes not only body heat, but the heat given off by such objects as light bulbs and refrigerators as well. The system works so well that no conventional fuel is needed to make the campus's six buildings comfortable.
Some parts of most modern buildings－theaters and offices as well as classrooms are more than amply heated by people and lights and sometimes must be air-conditioned even in winter. The technique of saving heat and redistributing it is called “heat recovery.” A few modern buildings recover heat, but the University's system is the first to recover heat from some buildings and reuse it in others.
Along the way, pit has learned a great deal about some of its heat producers. The harder a student studies, the more heat his body gives off. Male students emit more heat than female students, and the larger a student, the more heat the produces. It is tempting to conclude that the hottest prospect for the Johnstown campus would be a hardworking, overweight male genius.
Which of the following is true of the heating system of the Johnstown campus?（　　）
A.Theheatissuppliedbyhumanbodiesonly
B.Theheatissuppliedbybothhumanbodiesandotherheat-emittingobjects
C.Theheatissuppliedbybothhumanbodiesandconventionalfuel
D.Theheatissuppliedbyhumanbodies,otherheat-emittingobjects,andconventionalfuel
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