密闭容器内有X、Y、Z、Q四种物质,在一定条件下充分反应,测得反应前后各物质的质量如下,下列说法正确的是( ) 物质XYZQ 反应前质量/g22845 反应后质量/g待测24014 A.该反应为分解反应 B.反应生成的X与Y的质量比为55:24 C.反应中X为反应物 D.参加反应的X与Y的分子个数比为1:1 答案:A
找出你所听到的句子的最佳答语。念两遍。
( )1.A.Yes, I do. ( )2.A.That's OK. ( )3.A.Sure, I'm coming.( )4.A.Yes, they do. ( )5.A.Yes, I can
B.I would like. B.I'd like some eggs. B.Yes, I could. B.Yes, I am. B.That's easy.
C.No, thanks. C.You are right. C.No, I couldn't. C.Yes, they are. C.N-E-W, new.