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铁塔基础施工过程中需用()混凝土二次浇筑。
A. C20
B. C30
C35
D. 比基础混凝土高一等级
做砂子的颗粒级配试验时,如果两次试验的细度模数之差超过()时,须重新试验。
A. 0.10
B. 0.15
C. 0.20
D. 0.50
If the surveyors ()yesterday, they would have finished the survey work.
A. did not interrupt
B. were not interrupted
C. had not interrupted
D. had not been interrupted
一国居民出国旅游属于()。
A. 调节性交易
B. 补偿性交易
C. 事后交易
D. 自主性交易