A. 携带方便 B. 多剂量装置 C. 协调性要求低 D. 可用于急、慢性哮喘
A. 触媒结焦 B. 转换器漏 C. 转化器阻力大 D. 系统压力高
And you? B. Nice to meet you, too. C. Very nice.
A. 正确 B. 错误