喉不具有的生理功能是:()
A.呼吸功能
B.发声功能
C.声音共鸣功能
D.保护下呼吸道功能
E.屏气功能
参考答案:C
Because of the continuous bad weather, the building work of the bridge over the Yangtze River is far behind
A.regulation
B.procedure
C.schedule
D.campaign
冠心病多发生在以后,脑力劳动者居多()
A.25岁
B.35岁
C.40岁
D.45岁
E.50岁