题目

某温度下,在一容积可变的恒压密闭容器里,反应3A(g)  B(g)+3C(g)达到平衡时,A、B、C的物质的量分别是6mol,2mol,6mol.在保持温度和压强不变的条件下,下列说法正确的是A.充入1mol的He(He与容器里的气体不反应),平衡不移动B.充入A、B、C各2mol,平衡将向正反应方向移动C.将A、B、C各减少1mol,达平衡后C的百分含量增加D.加入一定量的A气体达平衡后,C的百分含量一定增加 根据上句，选出正确的应答1. What's the time, Su Yang?   [     ]A. It's seven o'clock.    B.  It's time to go home.2. It's time to go to school.   [     ]A. Good moming.    B. OK. Goodbye, Mum.3. What's this in your school bag?   [     ]A. It's a knife.    B. Yes, it is.4. Who's she?    [     ]A. She's my sister.    B. It's five.5. Shall we watch TV?     [     ]A. All right.    B. Thank you.