慢支急性发作期治疗最主要的措施是

A．止咳去痰

B．控制感染

C．解痉平喘

D．菌苗注射

E．吸氧补液

A stopper is（）.

A.a short length of line used for temporarily holding another line

B.a snatch block for handling a topping lift

C.an engine order telegraph

D.the brake on a cargo winch