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一、填空题(每题2分 ,共40分)1.钢筋混凝土用热轧带肋钢筋的牌号由HRB和()最小值构成。2.钢筋混凝土用热轧带肋钢筋符号H、R、B分别为()、()和()三个词的英文首位字母。3.钢筋混凝土用热轧带肋钢筋牌号分为()、()和()三类。4.钢筋混凝土用热轧带肋钢筋的公称直径范围为()mm。5.钢筋混凝土用热轧带肋钢筋推荐钢
First, fill in the blank question (each question 2 points, a total of 40 points) 1 reinforced concrete with hot-rolled ribbed steel grades by the HRB and () minimum composition. 2. Hot-rolled reinforced concrete bars with bars H, R, B, respectively, (), () and () the first three letters of the English alphabet. 3. Reinforced concrete hot-rolled ribbed steel grades are divided into (), () and () three categories. 4. Reinforced concrete hot-rolled ribbed bar with a nominal diameter range () mm. 5. Reinforced concrete with hot-rolled ribbed steel recommended steel