两瓶气体分别为NO2和溴蒸气,外观均相同,某同学设计了各种鉴别法,①用湿润的KI淀粉试纸 ②加少量NaCl溶液 ③加少量AgNO3溶液 ④加少量水后再加适量苯 ⑤一定条件下改变温度,则下列选项正确的是( ) A.只能采用①③④ B.只能采用②③④ C.能采用②③④⑤ D.都可以 You
may use the room as you like ___ you clean it up afterwards.
A. so far
as B. so long as C. in case D.
even if