— ________ on the bed.
A:is, It's
B:are, They are
C:is, They're
D:are, It's
Many people try to jump the q____ for the tickets.
探究“电流通过导体产生的热量跟什么因素有关”,某同学将两段阻值不同的电阻丝R1、R2分别密封在两个完全相同的烧瓶中,并设计了如图所示的甲、乙两套装置。已知电源电压相等且保持不变,R1<R2,装入烧瓶的煤油质量相等。下列有关此探究活动的各种表述,错误的是 ( )