【简答题】Visitors can find a small, old house called the O. Henry Museum in central Austin, Texas. William Sydney Porter(1862-1910)----better known as O. Henry, was one of America’s best loved writers of short...
【判断题】The two H-O bonds in a water molecule are highly polar because the O is strongly attractive for electrons, whereas the H is only weakly attractive.
【单选题】In formaldehyde (CH 2 =O), C is less electronegative than the oxygen to which it is bonded, and the O atom therefore owns both electrons of the C–O bond, leaving C with ___ bonding electrons.