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【单选题】
少筋梁的正截面承载力取决于( )A.
混凝土的抗压强度
B.
混凝土的抗拉强度
C.
钢筋的抗压强度及配筋率
D.
钢筋的抗拉强度及配筋率
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举一反三
【简答题】The use of fossil fuels was the highest in the 1940s.
【单选题】The of fossil fuels, with its by-product of waste gases, has been the subject of a number of treaties and acts of international institutions.
A.
production
B.
incin eration
C.
objection
D.
subjection
【简答题】What are the problems of fossil fuels?A. They are limited. B. They cause health and enviornmental problems. C. They are hard to exploit. D. Both A and B.
【单选题】The burning of fossil fuels results in the pollution of the______.
A.
steam
B.
gas
C.
vapor
D.
atmosphere
【简答题】Global warming results from the burning of fossil fuels , such as petroleum products, resulting in the release of greenhouse gases into the atmosphere.
【判断题】The use of fossil fuels threatens the health of human beings and the environment.
A.
正确
B.
错误
【单选题】To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least an ______ alternative energy source.
A.
anticipated
B.
official
C.
equivalent
D.
emotional
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