A:可在外壳中找到32P
B:可在DNA中找到32P
C:可在外壳中找到35S和32P
D:可在DNA中找到35S
6x+2x=48
x=____
①NH4Cl ②NH4HSO4③NH4Fe(SO4)2④NH3•H2O.
( )它又高又瘦,英语怎么说: