由于遗传物质发生变化而引起的疾病,叫___________。我国《婚姻法》规定,直系血亲和三代以内的旁系血亲之间____________。
遗传病 禁止结婚
Either you or one of your students ________ to attend the meeting that is due tomorrow.
A.are B
B.is
C.have
D.be
吊装作业时悬吊重物上有浮置物会产生什么后果?