资源核验
1.已知集合A={x∈N|x<6},B={y=2x,x∈A},则A∩B中元素的个数是A.1B.2C.3D.42.已知复数z满足z(1+i)=1+3i其中i是虚数单位,设z是z的共轭复数,则z的虚部是 A. iB.1 C.-iD.-1