世袭制始于_________朝,分封制实行于_________。
夏;西周
—Can I have a day off tomorrow, Mr. Johnson?
—__________. I can manage without you.[ ]
A. Forget it
B. I'm afraid not
C. It depends
D. Of course
美术水磨石面层开磨时间与______有关。应以水泥石粒浆有______,开磨后石粒不会松动,水泥浆面与石粒面______为准。