题目内容
混凝土的常规检验包括混凝土强度和坍落度。( )
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某混凝土搅拌站原来使用的砂的细度模数为2.5，后来改用细度模数为2.1的砂。改用后，原混凝土配方不变，但发现混凝土坍落度明显变小。请简略分析坍落度变小的原因。
按照某市当前的电消费量来计算，如果每度电增收2分钱的电费，则每年可增加65亿元收入。这显然是解决电力公司年年亏损问题的好办法。这样做还可以减少消费者对电的需求，养成节约用电的良好习惯，从而保护短缺的电力资源。 以下哪一项最清楚地指出了上述论证中的错误( )
In the 1950’s, accumulating scientific evidence (26) cigarette smoking and lung cancer made a (27) impact (28) the smoking public. During this period many health agencies declared smoking to be a (29) hazard. US Surgeon GeneralLeroy E. Burney said in 1957, "The weight of the evidence is increasingly pointing to one direction: that (30) smoking is one of the causative factors in lung cancer." The initial reports had the heaviest impact, so (31) total cigarette production (32) in 1953 and again in 1954. (33) reports appeared to have less (34) on smoking habits, and by 1957 cigarette production had (35) above the 1952 level. (36) four voluntary health organizations (37) president John F. Kennedy to (38) a commission to study the widespread implications of the tobacco problem, the Surgeon General’ s Advisory Committee on Smoking and Health was (39) in 1962 to review and evaluate all (40) scientific data. When its report, Smoking and Health, was released in early 1964, cigarette (41) again declined (42) . Pipe and cigar smoking increased. More than 350 000 copies of the report were (43) and sold. (44) abstracts and pamphlets were prepared by the Public Health Service and other organizations (45) a massive educational campaign on the hazards of cigarette smoking.
混凝土立方体的抗压强度目的是检验混凝土的强度是否达到标号，并为控制施工质量提供依据。( )
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