A:(6a+5d-4c-12b) kJ/mol
B:(4c+12b-6a-5d) kJ/mol
C:(4c+12b-4a-5d) kJ/mol
D:(4a+5d-4c-12b) kJ/mol
— Who will go to the airport to meet Mary?
— I will. I ________ her several times. I can find her easily.
____+45=____+55,这里运用了加法____,用字母表示是____.
下列关于制取蒸馏水的实验装置与操作的说法中,不正确的是( )
如图1,在正方形ABCD中,延长BC至M,使BM=DN,连接MN交BD延长线于点E.