题目

 Expected noises are usually more _____ than unexpected ones of the like magnitude.    A. manageable    B. controllable    C. tolerable     D. perceivable   答案：C由和CO组成的混合气体在同温、同压下与氮气的密度相同．则该混合气体中和CO的体积比为 [　　] A．29∶8∶13B．22∶1∶14 C．13∶8∶29D．26∶16∶57