极坐标法放样点位,适用于______,并且放样点位离控制点较近,又便于测量距离。其计算和操作都比较简单灵活。
A.平坦地带 B.丘陵地区C.多山地区 D.高原地带
参考答案:A
It is ______ cold today and there is ______ rain. [ ]
A. too much; too much
B. much too; much too
C. too much; much too
D. much too; too much
蒽醌类成分按母核的结构可分为()和()两大类。