欲用统计图比较1994~2003年城市和农村3岁以下儿童贫血患病率的变化趋势,选用何种统计图形最为合适
A.条图B.半对数线图C.圆图D.直方图E.散点图
参考答案:B
One of the requirements for a fire is that the material______to its burning temperature.
A.is heated
B.will be heated
C.be heated
D.would be heated
Langhans巨细胞可出现在下列何种疾病中
A.结核病 B.伤寒C.梅毒 D.异物肉芽肿