A:10.9立方分米
B:9.0立方分米
C:4.9立方分米
D:5.3立方分米
读“我国主要河流分布示意图”,完成下面小题:
某同学测量一个圆柱体的电阻率,需要测量圆柱体的尺寸和电阻.
--- have you been here, Daniel?
--- Oh, for about two years.