A:worked
B:has worked
C:had worked
D:was working
我国濒临的海洋,从北到南依次是( )
目前我国自主研发的抗癌新药西达本胺即将全球上市.西达本胺由分子构成,其化学式为C22H19FN4O2,下列关于西达本胺的说法不正确的是( )
53+5=____
80-7=____
40-4=____
67+8=____