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单项选择题

关于龋病以下说法正确的是（ ）

A．龋病是发生牙齿硬组织的疾病
B．龋病是发生牙齿软组织的疾病
C．龋病是发生牙齿内部的疾病
D．龋病是发生牙周组织的疾病
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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.
Until recently, body heat has caused problems because it____.（　　）
A.wasdifficulttocollect
B.cameinavarietyofforms
C.wasdifficulttogetridof
D.tendedtobeabsorbedbyphysicalobjects
不定项选择
‍图示静定桁架，受对称荷载作用，则支座B 和支座C 的竖向反力相同。​
‍​
A．错误
B．正确
单项选择题
下述有关电气间布置的要求中，错误的是( )。
A.应靠近负荷中心和变配电所，以减少线路长度
B.应尽量与其他管井合用，以降低投资
C.应远离烟道，热力管道等设施
D.应尽量避免与楼梯间和电梯井等用同一竖井
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