题目内容
在普通混凝土配合比设计过程中，混凝土的耐久性主要通过控制其最大水灰比和最小水泥用量来达到要求。
查看答案
搜索结果不匹配？点我反馈
更多问题
当混凝土构件外观质量和尺寸偏差都评为优良，且结构性能检验合格时，该批构件评为优良。( )
对混凝土拌和物坍落度大于220mm的，应采用坍落度扩展法测定稠度。( )
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.
某建筑工程采用结构设计强度等级为C25的混凝土，结构实体检验留置的同一条件养护试块10组，试块取样、试压等均符合规范的有关规定，10组试块的强度代表值分别为：23.5MPa、20.6MPa、25.4MPa、23.8MPa、25.3MPa、24.5MPa、27.1MPa、23.2MPa、22.3MPa、26.3MPa。(已知：λ1=1.70，λ2=0.90。) 请根据上述条件，回答下列问题。 通过计算，请问同批10组试件抗压强度最小值fcu，min是否符合要求
微信支付 
支付宝支付