某灯具厂从1万件同批次产品中随机抽取了100件进行质检，发现其中有5件不合格，估计该厂这一万件产品中不合格品约为（ ）件。
500
He was a bit nervous. He _________his spare breath with a soft sound that was almost heard by the audience.
A．gave out
B．let out
C．picked out
D．blew out.
紫苏子治疗的病证是（）
A.肺燥咳嗽
B.肺虚久咳
C.肺热咳嗽
D.百日咳
E.痰壅咳喘
