第5题: [单项选择]关于颅部的生长发育哪些描述是不确切或是错误的() A. 颅部前后径的增长,主要是依靠颅底骨缝的生长 B. 颅部生长不成比例,前后径比上下径及左右径增加为多 C. 蝶枕骨结合在18~20岁仍存在生长发育 D. 蝶骨间软骨结合在出生时钙化,蝶筛软骨结合大约在出生后7年钙化 E. 颅底软骨结合过早钙化可造成上颌后缩,面中部凹陷 参考答案:A 答案解析:颅部前后径的增长,主要是依靠颅底软骨的生长。颅底骨缝的生长主要造成颅部左右径及上下径的增大。
第14题:[单选题]问题 2:What has to be done with the drums?( ) A. The drums were put on ends on the floor. B. The drums were put on ends on mats. C. Each tier of drums was dunnaged with planks. D. Each tier of drums was dunnaged with mats. 参考答案:C