【简答题】What is the good news for scientists? [A] The underground oil resources have not been affected. [B] Most of the desert animals and plants have managed to survive. [C] The oil lakes soon dry up and sto...
【单选题】以下哪种方式可在Excel中输入数值-6。
【单选题】Nowadays, good babysitters are in great _____, so many companies have been set up to train good babysitters. [ ]
【单选题】用于衡量色谱柱的分离效能高低的参数为()