下列分子中的中心原子杂化轨道的类型和分子构型都相同的是( )
A:CO2与SO2
B:NH3与BF3
C:CH4与NH4+
D:C2H2与C2H4
细胞通讯是细胞间交流信息,对环境作出综合反应的生理活动.如图甲为两种细胞通讯方式,乙为甲图中括号部位放大图,下列有关叙述中错误的是( )
(1) She bought a ____ (bath) suit last Sunday.(2)I like doing some ____ (shop) at weekends.(3)She hasn't ____ (feed) the cat yet.(4)There are about ten ____ (well) in that village.(5)Has the camera been____ (pack) yet?
想知道硬币上有无细菌,比较可行的检查方法是( )