钢筋按强度分类,HPB235级钢筋也叫( )。
A.Q235钢筋
B.25锰硅钢筋
C.40硅2锰钒、45硅锰钒、45硅2锰钛钢筋
D.20锰硅钢筋
参考答案:A
1) ______ the Oral Approach 2) ______ the Grammar-Translation Method 3) ______ the Communicative Approach 4) ______ the Cognitive Approach 5) ______ the Natural Approach a) Krashen’s monitor hypothesis b) behaviourist habit-formation theory c) innate organizing principles d) language as communication e) Faculty Psychology
在测试某水样氨氮时,取10mL水样于50mL比色管中,从校准曲线上查得氨氮为0.018mg,水样中氨氮含量是______。
A.1.8mg/L B.0.36mg/L C.9mg/L D.0.018mg/L