Just because they make more money than I do, ______ they seem to look down on me.
A:so
B:and
C:/
D:but
在置于暗室中的燕麦胚芽鞘尖端套上一个不透光的锡纸小帽,然后从右侧照光,结果是胚芽鞘将
设全集U={1,2,3,4,5,6}A={1,2},B={2,3,4},则A∩(∁UB)=( )
数一数,填一填。图中有____个,____个,____个,____个。
将人血涂片放在显微镜低倍镜下观察,可看到有细胞核的血细胞是( )