采用碘量法测定水中硫化物时,酸化—吹气—吸收处理时,吹气速度不影响测定结果。
参考答案:错
解析:吹气速度对结果有影响。
None of them had expected that the middleaged engineer died______his design uncompleted. [ ]
A. with
B. from
C. out
D. of
大跨径预应力混凝土桁式组合拱桥常用的形式是( )。
A.斜三角形式B.斜压杆式C.斜拉杆式D.三角形式