【单选题】要想获得较多碎片离子,采用如下哪种离子源?()
B.
FAB(适用于热不稳定,分子极性大,分子量大的)
【多选题】砌砖宣采用“三一砌筑法”,即( )的砌筑方法。
【多选题】砌筑宜采用“三一砌筑法”即()的砌筑方法。
【单选题】His car is in ______ poor condition that it can hardly run any more.
【单选题】C. Choose the best answer to complete each sentence. 6. His car is in poor condition that it can hardly run any more.
【单选题】His car is in poor condition that it can hardly run any more.