引起小儿颌下间隙感染的最多来源是A．外伤性 B．牙源性 C．血源性 D．淋巴腺源性 发布时间：2017-12-28 07:23 │ 来源：www.tikuol.com 题型：单项选择题 问题： 引起小儿颌下间隙感染的最多来源是A．外伤性B．牙源性C．血源性D．淋巴腺源性E．颌下腺源性
题型：单项选择题 Nowadays people take _____ exercise a day as they did in the past because of widely used automobiles.A. less than halfB. less than as half asC. less than half as muchD. half less than 查看答案