道路班车客运标志牌的发放，坚持“（）”的原则及“谁签字、谁发放、谁负责”的发放制度。
参考答案：谁审批、谁发放
My uncle ________ a worker, but now he _______in an office.
A．is, was
B．used to, is working
C．use to be, works
D．used to be, works
下列哪些病变叩诊出现鼓音 ( )
A．近胸壁处肺囊肘
B．胸腔积液
C．纵隔积气
D．肺内大空洞
E．左下胃泡区
