A:用含35S的培养基直接培养噬菌体
B:用含32P的培养基直接培养噬菌体
C:用含35S的培养基直接培养细菌,再用此细菌培养噬菌体
D:用含32P的培养基直接培养细菌,再用此细菌培养噬菌体
选择合适的单词填空。
am is are can can't Would don't