在Excel工作表中,单元格区域D3:F5所包含的单元格个数是()。
A、6
B、7
C、8
D、9
参考答案:D
Alice is so careful that she always goes over her test papers to ____ there are no mistakes.[ ]
A. look for
B. make sure
C. find out
D. think about
开采煤层气主要采用注水增压排气的方式进行。