【简答题】现有甲、乙两种砂,经筛分试验并计算出各筛累计筛余百分率列于表中,试分别计算甲、乙两种砂的细度模数并进行级配评定。若按甲砂40%,乙砂60%混合,试计算混合砂的细度模数并进行级配评定。(建议列表计算) 甲、乙与混合砂细度模数及级配评定 筛孔尺寸 (mm) 累计筛余百分率(%) 甲砂 乙砂 混合砂(甲占40%、乙占60%) 4.75 2.36 1.18 0.60 0.30 0.15 0 0 4 51 ...
【判断题】砂的级配按 2.36 mm 筛孔的累计筛余率分成三个级配区。
【简答题】We can see from the first paragraph that the first Labor Day march ________. A) immediately won nationwide support B) involved workers from 30 states C) was opposed by many factory owners D) was organ...
【简答题】创建一个视图文件ygbm,包含employees(别名emp)表的emp_name,列,departments(别名dep)表的dep_name列。两表均包含dep_id列,请写出代码。
【单选题】From the first paragraph we may conclude that multimedia are . 【 】
C.
telecommunications over LAN
【简答题】创建一个视图文件OS,包含orders(别名O)的orderid,customerid列,shippers(别名S)的companyname,phone列。O.shipvia=S.shipperid,请写出代码。
【简答题】A. At first sight B. At the beginning C. In the first view D. From the first
【单选题】普通水泥混凝土用砂,按( )筛孔的累计筛余百分率划分为 I、II、III三个级配区。
【单选题】砂的级配按( )筛孔的累计筛余百分率分成三个级配区。