炼焦炉的发展大体可分四大阶段,即成堆炼焦与窑式、倒焰炉、废热式炼炉及现代蓄热式焦炉。
参考答案:对
Frank put the mediocre in the top drawer to make sure it would not be _____ to the kids. [ ]
A. accessible
B. relative
C. acceptable
D. sensitive
计算题:某计量站检定流量计时,系统压力一般不超过0.3MPa。现有一块量程为1.0MPa,准确度等级为0.25级;另一块量程为0.4MPa,准确度等级为0.4级。试从提高测量准确度分析,应选择哪一块更合适?