二期罩式炉燃烧介质是（） ["高炉煤气","焦炉煤气","氢气","混合煤气"]
手机只在属于自己的寻呼子信道上收听网络下发的寻呼消息，主要目的是（）。 ["降低手机功耗","其它寻呼子信道没有寻呼消息","降低网内的干扰","降低基站的发射功率"]
A peculiarly pointed chin is his most memorable facial（） ["mark","feature","trace","appearance"]
灰分测定时，如果试样含水较多，在加热时会产生泡沫而溢出，可在称有试样的坩埚内加入1ml～2ml（）。 ["乙醇","石油醚","苯","异丙醇"]
This story is not real; it is only（） ["imaginary","imaginative","imaginable","imagined"]
正常生产时，SF段的露点一般控制在（）℃。
