【单选题】肺泡气中O2的分压大于CO2的分压,而静脉血中O2的分压小于CO2的分压。当静脉血流经肺泡壁毛细血管时,肺泡气中氧气溶入静脉血中,同时静脉血中的二氧化碳释放于肺泡气中,从而实现吸入氧气、呼出二氧化碳的过程。这一过程可用下列哪一化学定律来解释?
【单选题】某二溴苯经硝化 , 只能得到二种一硝基化合物 , 该二溴苯应为 :
【单选题】China is a country a long history. [ ]
【单选题】Look the map. It is a map China. [ ]
【单选题】His daughter is studying at a university, ____ is in southern China.
【简答题】--- Hello, may I talk to the head now? --- __________ . A. Sorry, he is busy at the moment B. No, you can’t C. Sorry, you can’t D. I don’t know 2. --- Do you think I could borrow your dictionary...
【单选题】某二溴苯经硝化,只能得到二种一硝基化合物,该二溴苯应为: