提供邮政业服务税率为（）
A、17%
B、11%
C、6%
D、3%
参考答案：B
________ in the school regulations that students should not wear long hair or jewels.
A．It is required
B．What is required
C．What requires
D．It required
胸部叩诊呈实音的是（）
A.肺气肿
B.大量胸腔积液
C.气胸
D.支气管肺炎
E.肺空洞
