矩形母线的最小允许截面积是由其动稳定条件决定的
参考答案:错
— ? — Yes. I like Shijiazhuang very much.[ ]
A. What do you think about Shijiazhuang
B. What are you doing in Shijiazhuang
C. Do you like Shijiazhuang
D. Why do you like Shijiazhuang
有明确过敏史和免疫功能缺陷的婴儿不能接种疫苗。