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交货检验的混凝土试样的采取及坍落度试验应在自混凝土运到交货地点时开始算起20min内完成，试样的制作应在1h内完成。( )
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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.
绝对体积法按每立方米混凝土的绝对体积为各组成材料的绝对体积之和进行计算。( )
By far the most common snake in Britain is the adder. In Scotland, in fact, there are no other snakes at all. The adder is also the only British snake with a poisonous bite. It can be found almost anywhere, but prefers’ sunny hillsides and rough open country, including high ground. In Ireland there are no snakes at all. Most people regard snake bites as fatal misfortune, but net all bites are serious, and very few are fatal. Sometimes attempts at emergency treatment turn out to be dangerous than the bite itself, with amateurs heroically, but mistakenly, trying do-it-yourself surgery and other unnecessary measures. All snakes have small teeth, so it follows that all snakes can bite, but only the bite of the adder presents any danger. British snakes are shy animals and are far more frightened of you than you could possibly be of him. The adder will attack only if it feels threatened, as can happen if you take it by surprise and step on it accidentally, or if you try to catch it or pick it up, which it dislikes intensely. If it hears you coming, it will normally get out of the way as quickly as it can, but adders cannot move very rapidly and may attack before moving if you are close. The effect of a bite varies considerably. It depends upon several things, one of which is the bodyweight of the person bitten. The bigger the person, the less harmful the bite is likely to be, which is why children suffer far more seriously from snake bites than adults. A healthy person will also have better resistance against the poison. Very few people actually die from snake bites in Britain and though these bites can make some people very ill, there are probably just as many cases of bites having little or no effect, as there are of serious illness. We are told that adders are______.
下列关于混凝土施工试验资料的收集排列的顺序，正确的是( )。
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