What do you think of_____football? [ ]
A. play
B. playing
C. plays
D. played
答案:B
白磷通常要保存在水里,因为它的着火点很低,在空气里容易因______而引起自燃,生成______色固体,此反应的化学方程式是______.
将子网掩码与IP地址进行二进制逻辑与运算,在运算后的结果中,非零的几组数值即为实际的网络ID()